[ndctl PATCH 0/5] make ndctl support global configuration files

[ndctl PATCH 0/5] make ndctl support global configuration files

[QI Fuli]

From: QI Fuli <qi.fuli@fujitsu.com>

This patch set is used to make ndctl support global configuration files.
All files with .conf suffix under {sysconfdir}/ndctl can be regarded
as ndctl global configration files that all ndctl commands can refer to.

Signed-off-by: QI Fuli <qi.fuli@fujitsu.com>

QI Fuli (5):
  ndctl, ccan: import ciniparser
  ndctl, util: add parse-configs helper
  ndctl: make ndctl support configuration files
  ndctl, config: add the default ndctl configuration file
  ndctl, monitor: refactor monitor for supporting multiple config files

 Documentation/ndctl/Makefile.am       |   2 +-
 Documentation/ndctl/ndctl-monitor.txt |   8 +-
 Makefile.am                           |   8 +-
 ccan/ciniparser/ciniparser.c          | 480 ++++++++++++++++++++++++++
 ccan/ciniparser/ciniparser.h          | 262 ++++++++++++++
 ccan/ciniparser/dictionary.c          | 266 ++++++++++++++
 ccan/ciniparser/dictionary.h          | 166 +++++++++
 configure.ac                          |   6 +-
 ndctl/Makefile.am                     |  10 +-
 ndctl/lib/Makefile.am                 |   4 +
 ndctl/lib/libndctl.c                  |  52 +++
 ndctl/lib/libndctl.sym                |   2 +
 ndctl/lib/private.h                   |   1 +
 ndctl/libndctl.h                      |   2 +
 ndctl/monitor.c                       |  69 ++--
 ndctl/ndctl.c                         |   1 +
 ndctl/ndctl.conf                      |  56 +++
 util/parse-configs.c                  |  82 +++++
 util/parse-configs.h                  |  34 ++
 19 files changed, 1467 insertions(+), 44 deletions(-)
 create mode 100644 ccan/ciniparser/ciniparser.c
 create mode 100644 ccan/ciniparser/ciniparser.h
 create mode 100644 ccan/ciniparser/dictionary.c
 create mode 100644 ccan/ciniparser/dictionary.h
 create mode 100644 ndctl/ndctl.conf
 create mode 100644 util/parse-configs.c
 create mode 100644 util/parse-configs.h

-- 
2.31.1

[ndctl PATCH 1/5] ndctl, ccan: import ciniparser

[QI Fuli]

Import ciniparser from ccan[1].
[1] https://ccodearchive.net/info/ciniparser.html

Signed-off-by: QI Fuli <qi.fuli@fujitsu.com>
---
 Makefile.am                  |   6 +-
 ccan/ciniparser/ciniparser.c | 480 +++++++++++++++++++++++++++++++++++
 ccan/ciniparser/ciniparser.h | 262 +++++++++++++++++++
 ccan/ciniparser/dictionary.c | 266 +++++++++++++++++++
 ccan/ciniparser/dictionary.h | 166 ++++++++++++
 5 files changed, 1179 insertions(+), 1 deletion(-)
 create mode 100644 ccan/ciniparser/ciniparser.c
 create mode 100644 ccan/ciniparser/ciniparser.h
 create mode 100644 ccan/ciniparser/dictionary.c
 create mode 100644 ccan/ciniparser/dictionary.h

diff --git a/Makefile.am b/Makefile.am
index 60a1998..960b5e9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -64,7 +64,11 @@ libccan_a_SOURCES = \
 	ccan/array_size/array_size.h \
 	ccan/minmax/minmax.h \
 	ccan/short_types/short_types.h \
-	ccan/endian/endian.h
+	ccan/endian/endian.h \
+	ccan/ciniparser/ciniparser.h \
+	ccan/ciniparser/ciniparser.c \
+	ccan/ciniparser/dictionary.h \
+	ccan/ciniparser/dictionary.c
 
 noinst_LIBRARIES += libutil.a
 libutil_a_SOURCES = \
diff --git a/ccan/ciniparser/ciniparser.c b/ccan/ciniparser/ciniparser.c
new file mode 100644
index 0000000..527f837
--- /dev/null
+++ b/ccan/ciniparser/ciniparser.c
@@ -0,0 +1,480 @@
+/* Copyright (c) 2000-2007 by Nicolas Devillard.
+ * Copyright (x) 2009 by Tim Post <tinkertim@gmail.com>
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/** @addtogroup ciniparser
+ * @{
+ */
+/**
+ *  @file ciniparser.c
+ *  @author N. Devillard
+ *  @date Sep 2007
+ *  @version 3.0
+ *  @brief Parser for ini files.
+ */
+
+#include <ctype.h>
+#include <ccan/ciniparser/ciniparser.h>
+
+#define ASCIILINESZ      (1024)
+#define INI_INVALID_KEY  ((char*) NULL)
+
+/**
+ * This enum stores the status for each parsed line (internal use only).
+ */
+typedef enum _line_status_ {
+	LINE_UNPROCESSED,
+	LINE_ERROR,
+	LINE_EMPTY,
+	LINE_COMMENT,
+	LINE_SECTION,
+	LINE_VALUE
+} line_status;
+
+
+/**
+ * @brief Convert a string to lowercase.
+ * @param s String to convert.
+ * @return ptr to statically allocated string.
+ *
+ * This function returns a pointer to a statically allocated string
+ * containing a lowercased version of the input string. Do not free
+ * or modify the returned string! Since the returned string is statically
+ * allocated, it will be modified at each function call (not re-entrant).
+ */
+static char *strlwc(const char *s)
+{
+	static char l[ASCIILINESZ+1];
+	int i;
+
+	if (s == NULL)
+		return NULL;
+
+	for (i = 0; s[i] && i < ASCIILINESZ; i++)
+		l[i] = tolower(s[i]);
+	l[i] = '\0';
+	return l;
+}
+
+/**
+ * @brief Remove blanks at the beginning and the end of a string.
+ * @param s String to parse.
+ * @return ptr to statically allocated string.
+ *
+ * This function returns a pointer to a statically allocated string,
+ * which is identical to the input string, except that all blank
+ * characters at the end and the beg. of the string have been removed.
+ * Do not free or modify the returned string! Since the returned string
+ * is statically allocated, it will be modified at each function call
+ * (not re-entrant).
+ */
+static char *strstrip(const char *s)
+{
+	static char l[ASCIILINESZ+1];
+	unsigned int i, numspc;
+
+	if (s == NULL)
+		return NULL;
+
+	while (isspace(*s))
+		s++;
+
+	for (i = numspc = 0; s[i] && i < ASCIILINESZ; i++) {
+		l[i] = s[i];
+		if (isspace(l[i]))
+			numspc++;
+		else
+			numspc = 0;
+	}
+	l[i - numspc] = '\0';
+	return l;
+}
+
+/**
+ * @brief Load a single line from an INI file
+ * @param input_line Input line, may be concatenated multi-line input
+ * @param section Output space to store section
+ * @param key Output space to store key
+ * @param value Output space to store value
+ * @return line_status value
+ */
+static
+line_status ciniparser_line(char *input_line, char *section,
+	char *key, char *value)
+{
+	line_status sta;
+	char line[ASCIILINESZ+1];
+	int	 len;
+
+	strcpy(line, strstrip(input_line));
+	len = (int) strlen(line);
+
+	if (len < 1) {
+		/* Empty line */
+		sta = LINE_EMPTY;
+	} else if (line[0] == '#') {
+		/* Comment line */
+		sta = LINE_COMMENT;
+	} else if (line[0] == '[' && line[len-1] == ']') {
+		/* Section name */
+		sscanf(line, "[%[^]]", section);
+		strcpy(section, strstrip(section));
+		strcpy(section, strlwc(section));
+		sta = LINE_SECTION;
+	} else if (sscanf (line, "%[^=] = \"%[^\"]\"", key, value) == 2
+		   ||  sscanf (line, "%[^=] = '%[^\']'", key, value) == 2
+		   ||  sscanf (line, "%[^=] = %[^;#]", key, value) == 2) {
+		/* Usual key=value, with or without comments */
+		strcpy(key, strstrip(key));
+		strcpy(key, strlwc(key));
+		strcpy(value, strstrip(value));
+		/*
+		 * sscanf cannot handle '' or "" as empty values
+		 * this is done here
+		 */
+		if (!strcmp(value, "\"\"") || (!strcmp(value, "''"))) {
+			value[0] = 0;
+		}
+		sta = LINE_VALUE;
+	} else if (sscanf(line, "%[^=] = %[;#]", key, value) == 2
+		||  sscanf(line, "%[^=] %[=]", key, value) == 2) {
+		/*
+		 * Special cases:
+		 * key=
+		 * key=;
+		 * key=#
+		 */
+		strcpy(key, strstrip(key));
+		strcpy(key, strlwc(key));
+		value[0] = 0;
+		sta = LINE_VALUE;
+	} else {
+		/* Generate syntax error */
+		sta = LINE_ERROR;
+	}
+	return sta;
+}
+
+/* The remaining public functions are documented in ciniparser.h */
+
+int ciniparser_getnsec(dictionary *d)
+{
+	int i;
+	int nsec;
+
+	if (d == NULL)
+		return -1;
+
+	nsec = 0;
+	for (i = 0; i < d->size; i++) {
+		if (d->key[i] == NULL)
+			continue;
+		if (strchr(d->key[i], ':') == NULL) {
+			nsec ++;
+		}
+	}
+
+	return nsec;
+}
+
+char *ciniparser_getsecname(dictionary *d, int n)
+{
+	int i;
+	int foundsec;
+
+	if (d == NULL || n < 0)
+		return NULL;
+
+	if (n == 0)
+		n ++;
+
+	foundsec = 0;
+
+	for (i = 0; i < d->size; i++) {
+		if (d->key[i] == NULL)
+			continue;
+		if (! strchr(d->key[i], ':')) {
+			foundsec++;
+			if (foundsec >= n)
+				break;
+		}
+	}
+
+	if (foundsec == n) {
+		return d->key[i];
+	}
+
+	return (char *) NULL;
+}
+
+void ciniparser_dump(dictionary *d, FILE *f)
+{
+	int i;
+
+	if (d == NULL || f == NULL)
+		return;
+
+	for (i = 0; i < d->size; i++) {
+		if (d->key[i] == NULL)
+			continue;
+		if (d->val[i] != NULL) {
+			fprintf(f, "[%s]=[%s]\n", d->key[i], d->val[i]);
+		} else {
+			fprintf(f, "[%s]=UNDEF\n", d->key[i]);
+		}
+	}
+
+	return;
+}
+
+void ciniparser_dump_ini(dictionary *d, FILE *f)
+{
+	int i, j;
+	char keym[ASCIILINESZ+1];
+	int nsec;
+	char *secname;
+	int seclen;
+
+	if (d == NULL || f == NULL)
+		return;
+
+	memset(keym, 0, ASCIILINESZ + 1);
+
+	nsec = ciniparser_getnsec(d);
+	if (nsec < 1) {
+		/* No section in file: dump all keys as they are */
+		for (i = 0; i < d->size; i++) {
+			if (d->key[i] == NULL)
+				continue;
+			fprintf(f, "%s = %s\n", d->key[i], d->val[i]);
+		}
+		return;
+	}
+
+	for (i = 0; i < nsec; i++) {
+		secname = ciniparser_getsecname(d, i);
+		seclen  = (int)strlen(secname);
+		fprintf(f, "\n[%s]\n", secname);
+		snprintf(keym, ASCIILINESZ + 1, "%s:", secname);
+		for (j = 0; j < d->size; j++) {
+			if (d->key[j] == NULL)
+				continue;
+			if (!strncmp(d->key[j], keym, seclen+1)) {
+				fprintf(f, "%-30s = %s\n",
+					d->key[j]+seclen+1,
+					d->val[j] ? d->val[j] : "");
+			}
+		}
+	}
+	fprintf(f, "\n");
+
+	return;
+}
+
+char *ciniparser_getstring(dictionary *d, const char *key, char *def)
+{
+	char *lc_key;
+	char *sval;
+
+	if (d == NULL || key == NULL)
+		return def;
+
+	lc_key = strlwc(key);
+	sval = dictionary_get(d, lc_key, def);
+
+	return sval;
+}
+
+int ciniparser_getint(dictionary *d, const char *key, int notfound)
+{
+	char *str;
+
+	str = ciniparser_getstring(d, key, INI_INVALID_KEY);
+
+	if (str == INI_INVALID_KEY)
+		return notfound;
+
+	return (int) strtol(str, NULL, 10);
+}
+
+double ciniparser_getdouble(dictionary *d, const char *key, double notfound)
+{
+	char *str;
+
+	str = ciniparser_getstring(d, key, INI_INVALID_KEY);
+
+	if (str == INI_INVALID_KEY)
+		return notfound;
+
+	return atof(str);
+}
+
+int ciniparser_getboolean(dictionary *d, const char *key, int notfound)
+{
+	char *c;
+	int ret;
+
+	c = ciniparser_getstring(d, key, INI_INVALID_KEY);
+	if (c == INI_INVALID_KEY)
+		return notfound;
+
+	switch(c[0]) {
+	case 'y': case 'Y': case '1': case 't': case 'T':
+		ret = 1;
+		break;
+	case 'n': case 'N': case '0': case 'f': case 'F':
+		ret = 0;
+		break;
+	default:
+		ret = notfound;
+		break;
+	}
+
+	return ret;
+}
+
+int ciniparser_find_entry(dictionary *ini, char *entry)
+{
+	int found = 0;
+
+	if (ciniparser_getstring(ini, entry, INI_INVALID_KEY) != INI_INVALID_KEY) {
+		found = 1;
+	}
+
+	return found;
+}
+
+int ciniparser_set(dictionary *d, char *entry, char *val)
+{
+	return dictionary_set(d, strlwc(entry), val);
+}
+
+void ciniparser_unset(dictionary *ini, char *entry)
+{
+	dictionary_unset(ini, strlwc(entry));
+}
+
+dictionary *ciniparser_load(const char *ininame)
+{
+	FILE *in;
+	char line[ASCIILINESZ+1];
+	char section[ASCIILINESZ+1];
+	char key[ASCIILINESZ+1];
+	char tmp[ASCIILINESZ+1];
+	char val[ASCIILINESZ+1];
+	int  last = 0, len, lineno = 0, errs = 0;
+	dictionary *dict;
+
+	if ((in = fopen(ininame, "r")) == NULL) {
+		fprintf(stderr, "ciniparser: cannot open %s\n", ininame);
+		return NULL;
+	}
+
+	dict = dictionary_new(0);
+	if (!dict) {
+		fclose(in);
+		return NULL;
+	}
+
+	memset(line, 0, ASCIILINESZ + 1);
+	memset(section, 0, ASCIILINESZ + 1);
+	memset(key, 0, ASCIILINESZ + 1);
+	memset(val, 0, ASCIILINESZ + 1);
+	last = 0;
+
+	while (fgets(line+last, ASCIILINESZ-last, in)!=NULL) {
+		lineno++;
+		len = (int) strlen(line)-1;
+		/* Safety check against buffer overflows */
+		if (line[len] != '\n') {
+			fprintf(stderr,
+					"ciniparser: input line too long in %s (%d)\n",
+					ininame,
+					lineno);
+			dictionary_del(dict);
+			fclose(in);
+			return NULL;
+		}
+
+		/* Get rid of \n and spaces at end of line */
+		while ((len >= 0) &&
+				((line[len] == '\n') || (isspace(line[len])))) {
+			line[len] = 0;
+			len--;
+		}
+
+		/* Detect multi-line */
+		if (len >= 0 && line[len] == '\\') {
+			/* Multi-line value */
+			last = len;
+			continue;
+		}
+
+		switch (ciniparser_line(line, section, key, val)) {
+		case LINE_EMPTY:
+		case LINE_COMMENT:
+			break;
+
+		case LINE_SECTION:
+			errs = dictionary_set(dict, section, NULL);
+			break;
+
+		case LINE_VALUE:
+			snprintf(tmp, ASCIILINESZ + 1, "%s:%s", section, key);
+			errs = dictionary_set(dict, tmp, val);
+			break;
+
+		case LINE_ERROR:
+			fprintf(stderr, "ciniparser: syntax error in %s (%d):\n",
+					ininame, lineno);
+			fprintf(stderr, "-> %s\n", line);
+			errs++;
+			break;
+
+		default:
+			break;
+		}
+		memset(line, 0, ASCIILINESZ);
+		last = 0;
+		if (errs < 0) {
+			fprintf(stderr, "ciniparser: memory allocation failure\n");
+			break;
+		}
+	}
+
+	if (errs) {
+		dictionary_del(dict);
+		dict = NULL;
+	}
+
+	fclose(in);
+
+	return dict;
+}
+
+void ciniparser_freedict(dictionary *d)
+{
+	dictionary_del(d);
+}
+
+/** @}
+ */
diff --git a/ccan/ciniparser/ciniparser.h b/ccan/ciniparser/ciniparser.h
new file mode 100644
index 0000000..b61c1d6
--- /dev/null
+++ b/ccan/ciniparser/ciniparser.h
@@ -0,0 +1,262 @@
+#ifndef _INIPARSER_H_
+#define _INIPARSER_H_
+
+/* Copyright (c) 2000-2007 by Nicolas Devillard.
+ * Copyright (x) 2009 by Tim Post <tinkertim@gmail.com>
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/** @addtogroup ciniparser
+ * @{
+ */
+
+/**
+ * @file    ciniparser.h
+ * @author  N. Devillard
+ * @date    Sep 2007
+ * @version 3.0
+ * @brief   Parser for ini files.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "dictionary.h"
+
+#define ciniparser_getstr(d, k)  ciniparser_getstring(d, k, NULL)
+#define ciniparser_setstr        ciniparser_setstring
+
+/**
+ * @brief    Get number of sections in a dictionary
+ * @param    d   Dictionary to examine
+ * @return   int Number of sections found in dictionary, -1 on error
+ *
+ * This function returns the number of sections found in a dictionary.
+ * The test to recognize sections is done on the string stored in the
+ * dictionary: a section name is given as "section" whereas a key is
+ * stored as "section:key", thus the test looks for entries that do not
+ * contain a colon.
+ *
+ * This clearly fails in the case a section name contains a colon, but
+ * this should simply be avoided.
+ */
+int ciniparser_getnsec(dictionary *d);
+
+/**
+ * @brief    Get name for section n in a dictionary.
+ * @param    d   Dictionary to examine
+ * @param    n   Section number (from 0 to nsec-1).
+ * @return   Pointer to char string, NULL on error
+ *
+ * This function locates the n-th section in a dictionary and returns
+ * its name as a pointer to a string statically allocated inside the
+ * dictionary. Do not free or modify the returned string!
+ */
+char *ciniparser_getsecname(dictionary *d, int n);
+
+/**
+ * @brief    Save a dictionary to a loadable ini file
+ * @param    d   Dictionary to dump
+ * @param    f   Opened file pointer to dump to
+ * @return   void
+ *
+ * This function dumps a given dictionary into a loadable ini file.
+ * It is Ok to specify @c stderr or @c stdout as output files.
+ */
+void ciniparser_dump_ini(dictionary *d, FILE *f);
+
+/**
+ * @brief    Dump a dictionary to an opened file pointer.
+ * @param    d   Dictionary to dump.
+ * @param    f   Opened file pointer to dump to.
+ * @return   void
+ *
+ * This function prints out the contents of a dictionary, one element by
+ * line, onto the provided file pointer. It is OK to specify @c stderr
+ * or @c stdout as output files. This function is meant for debugging
+ * purposes mostly.
+ */
+void ciniparser_dump(dictionary *d, FILE *f);
+
+/**
+ * @brief    Get the string associated to a key
+ * @param    d       Dictionary to search
+ * @param    key     Key string to look for
+ * @param    def     Default value to return if key not found.
+ * @return   pointer to statically allocated character string
+ *
+ * This function queries a dictionary for a key. A key as read from an
+ * ini file is given as "section:key". If the key cannot be found,
+ * the pointer passed as 'def' is returned.
+ * The returned char pointer is pointing to a string allocated in
+ * the dictionary, do not free or modify it.
+ */
+char *ciniparser_getstring(dictionary *d, const char *key, char *def);
+
+/**
+ * @brief    Get the string associated to a key, convert to an int
+ * @param    d Dictionary to search
+ * @param    key Key string to look for
+ * @param    notfound Value to return in case of error
+ * @return   integer
+ *
+ * This function queries a dictionary for a key. A key as read from an
+ * ini file is given as "section:key". If the key cannot be found,
+ * the notfound value is returned.
+ *
+ * Supported values for integers include the usual C notation
+ * so decimal, octal (starting with 0) and hexadecimal (starting with 0x)
+ * are supported. Examples:
+ *
+ * - "42"      ->  42
+ * - "042"     ->  34 (octal -> decimal)
+ * - "0x42"    ->  66 (hexa  -> decimal)
+ *
+ * Warning: the conversion may overflow in various ways. Conversion is
+ * totally outsourced to strtol(), see the associated man page for overflow
+ * handling.
+ *
+ * Credits: Thanks to A. Becker for suggesting strtol()
+ */
+int ciniparser_getint(dictionary *d, const char *key, int notfound);
+
+/**
+ * @brief    Get the string associated to a key, convert to a double
+ * @param    d Dictionary to search
+ * @param    key Key string to look for
+ * @param    notfound Value to return in case of error
+ * @return   double
+ *
+ * This function queries a dictionary for a key. A key as read from an
+ * ini file is given as "section:key". If the key cannot be found,
+ * the notfound value is returned.
+ */
+double ciniparser_getdouble(dictionary *d, const char *key, double notfound);
+
+/**
+ * @brief    Get the string associated to a key, convert to a boolean
+ * @param    d Dictionary to search
+ * @param    key Key string to look for
+ * @param    notfound Value to return in case of error
+ * @return   integer
+ *
+ * This function queries a dictionary for a key. A key as read from an
+ * ini file is given as "section:key". If the key cannot be found,
+ * the notfound value is returned.
+ *
+ * A true boolean is found if one of the following is matched:
+ *
+ * - A string starting with 'y'
+ * - A string starting with 'Y'
+ * - A string starting with 't'
+ * - A string starting with 'T'
+ * - A string starting with '1'
+ *
+ * A false boolean is found if one of the following is matched:
+ *
+ * - A string starting with 'n'
+ * - A string starting with 'N'
+ * - A string starting with 'f'
+ * - A string starting with 'F'
+ * - A string starting with '0'
+ *
+ * The notfound value returned if no boolean is identified, does not
+ * necessarily have to be 0 or 1.
+ */
+int ciniparser_getboolean(dictionary *d, const char *key, int notfound);
+
+/**
+ * @brief    Set an entry in a dictionary.
+ * @param    ini     Dictionary to modify.
+ * @param    entry   Entry to modify (entry name)
+ * @param    val     New value to associate to the entry.
+ * @return   int 0 if Ok, -1 otherwise.
+ *
+ * If the given entry can be found in the dictionary, it is modified to
+ * contain the provided value. If it cannot be found, -1 is returned.
+ * It is Ok to set val to NULL.
+ */
+int ciniparser_setstring(dictionary *ini, char *entry, char *val);
+
+/**
+ * @brief    Delete an entry in a dictionary
+ * @param    ini     Dictionary to modify
+ * @param    entry   Entry to delete (entry name)
+ * @return   void
+ *
+ * If the given entry can be found, it is deleted from the dictionary.
+ */
+void ciniparser_unset(dictionary *ini, char *entry);
+
+/**
+ * @brief    Finds out if a given entry exists in a dictionary
+ * @param    ini     Dictionary to search
+ * @param    entry   Name of the entry to look for
+ * @return   integer 1 if entry exists, 0 otherwise
+ *
+ * Finds out if a given entry exists in the dictionary. Since sections
+ * are stored as keys with NULL associated values, this is the only way
+ * of querying for the presence of sections in a dictionary.
+ */
+int ciniparser_find_entry(dictionary *ini, char *entry) ;
+
+/**
+ * @brief    Parse an ini file and return an allocated dictionary object
+ * @param    ininame Name of the ini file to read.
+ * @return   Pointer to newly allocated dictionary
+ *
+ * This is the parser for ini files. This function is called, providing
+ * the name of the file to be read. It returns a dictionary object that
+ * should not be accessed directly, but through accessor functions
+ * instead.
+ *
+ * The returned dictionary must be freed using ciniparser_freedict().
+ */
+dictionary *ciniparser_load(const char *ininame);
+
+/**
+ * @brief    Free all memory associated to an ini dictionary
+ * @param    d Dictionary to free
+ * @return   void
+ *
+ * Free all memory associated to an ini dictionary.
+ * It is mandatory to call this function before the dictionary object
+ * gets out of the current context.
+ */
+void ciniparser_freedict(dictionary *d);
+
+/**
+ * @brief Set an item in the dictionary
+ * @param d      Dictionary object created by ciniparser_load()
+ * @param entry  Entry in the dictionary to manipulate
+ * @param val    Value to assign to the entry
+ * @return       0 on success, -1 on error
+ *
+ * Remember that string values are converted by ciniparser_getboolean(),
+ * ciniparser_getdouble(), etc. It is also OK to set an entry to NULL.
+ */
+int ciniparser_set(dictionary *d, char *entry, char *val);
+
+#endif
+/** @}
+ */
diff --git a/ccan/ciniparser/dictionary.c b/ccan/ciniparser/dictionary.c
new file mode 100644
index 0000000..19dd641
--- /dev/null
+++ b/ccan/ciniparser/dictionary.c
@@ -0,0 +1,266 @@
+/* Copyright (c) 2000-2007 by Nicolas Devillard.
+ * Copyright (x) 2009 by Tim Post <tinkertim@gmail.com>
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/** @addtogroup ciniparser
+ * @{
+ */
+/**
+ * @file dictionary.c
+ * @author N. Devillard
+ * @date Sep 2007
+ * @version $Revision: 1.27 $
+ * @brief Implements a dictionary for string variables.
+ *
+ * This module implements a simple dictionary object, i.e. a list
+ * of string/string associations. This object is useful to store e.g.
+ * information retrieved from a configuration file (ini files).
+ */
+
+#include "dictionary.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/** Maximum value size for integers and doubles. */
+#define MAXVALSZ	1024
+
+/** Minimal allocated number of entries in a dictionary */
+#define DICTMINSZ	128
+
+/** Invalid key token */
+#define DICT_INVALID_KEY	((char*)-1)
+
+/**
+ * @brief Double the allocated size associated to a pointer
+ * @param size the current allocated size
+ * @return re-allocated pointer on success, NULL on failure
+ */
+static void *mem_double(void *ptr, int size)
+{
+	void *newptr;
+
+	newptr = calloc(2 * size, 1);
+	if (newptr == NULL) {
+		return NULL;
+	}
+	memcpy(newptr, ptr, size);
+	free(ptr);
+	return newptr;
+}
+
+/* The remaining exposed functions are documented in dictionary.h */
+
+unsigned dictionary_hash(const char *key)
+{
+	int len;
+	unsigned hash;
+	int i;
+
+	len = strlen(key);
+	for (hash = 0, i = 0; i < len; i++) {
+		hash += (unsigned) key[i];
+		hash += (hash << 10);
+		hash ^= (hash >> 6);
+	}
+	hash += (hash << 3);
+	hash ^= (hash >> 11);
+	hash += (hash << 15);
+	return hash;
+}
+
+dictionary *dictionary_new(int size)
+{
+	dictionary *d;
+
+	/* If no size was specified, allocate space for DICTMINSZ */
+	if (size<DICTMINSZ) size=DICTMINSZ;
+
+	if (!(d = (dictionary *) calloc(1, sizeof(dictionary)))) {
+		return NULL;
+	}
+	d->size = size;
+	d->val  = (char **) calloc(size, sizeof(char *));
+	d->key  = (char **) calloc(size, sizeof(char *));
+	d->hash = (unsigned int *) calloc(size, sizeof(unsigned));
+	return d;
+}
+
+void dictionary_del(dictionary *d)
+{
+	int i;
+
+	if (d == NULL)
+		return;
+	for (i = 0; i < d->size; i++) {
+		if (d->key[i] != NULL)
+			free(d->key[i]);
+		if (d->val[i] != NULL)
+			free(d->val[i]);
+	}
+	free(d->val);
+	free(d->key);
+	free(d->hash);
+	free(d);
+	return;
+}
+
+char *dictionary_get(dictionary *d, const char *key, char *def)
+{
+	unsigned hash;
+	int i;
+
+	hash = dictionary_hash(key);
+	for (i=0; i < d->size; i++) {
+		if (d->key[i] == NULL)
+			continue;
+		/* Compare hash */
+		if (hash == d->hash[i]) {
+			/* Compare string, to avoid hash collisions */
+			if (!strcmp(key, d->key[i])) {
+				return d->val[i];
+			}
+		}
+	}
+	return def;
+}
+
+int dictionary_set(dictionary *d, const char *key, char *val)
+{
+	int i;
+	unsigned hash;
+
+	if (d==NULL || key==NULL)
+		return -1;
+
+	/* Compute hash for this key */
+	hash = dictionary_hash(key);
+	/* Find if value is already in dictionary */
+	if (d->n > 0) {
+		for (i = 0; i < d->size; i++) {
+			if (d->key[i] == NULL)
+				continue;
+			/* Same hash value */
+			if (hash == d->hash[i]) {
+				/* Same key */
+				if (!strcmp(key, d->key[i])) {
+					/* Found a value: modify and return */
+					if (d->val[i] != NULL)
+						free(d->val[i]);
+					d->val[i] = val ? strdup(val) : NULL;
+					/* Value has been modified: return */
+					return 0;
+				}
+			}
+		}
+	}
+
+	/* Add a new value
+	 * See if dictionary needs to grow */
+	if (d->n == d->size) {
+		/* Reached maximum size: reallocate dictionary */
+		d->val  = (char **) mem_double(d->val, d->size * sizeof(char *));
+		d->key  = (char **) mem_double(d->key, d->size * sizeof(char *));
+		d->hash = (unsigned int *)
+			mem_double(d->hash, d->size * sizeof(unsigned));
+		if ((d->val == NULL) || (d->key == NULL) || (d->hash == NULL))
+			/* Cannot grow dictionary */
+			return -1;
+		/* Double size */
+		d->size *= 2;
+	}
+
+	/* Insert key in the first empty slot */
+	for (i = 0; i < d->size; i++) {
+		if (d->key[i] == NULL) {
+			/* Add key here */
+			break;
+		}
+	}
+	/* Copy key */
+	d->key[i] = strdup(key);
+	d->val[i] = val ? strdup(val) : NULL;
+	d->hash[i] = hash;
+	d->n ++;
+	return 0;
+}
+
+void dictionary_unset(dictionary *d, const char *key)
+{
+	unsigned hash;
+	int i;
+
+	if (key == NULL)
+		return;
+
+	hash = dictionary_hash(key);
+	for (i = 0; i < d->size; i++) {
+		if (d->key[i] == NULL)
+			continue;
+		/* Compare hash */
+		if (hash == d->hash[i]) {
+			/* Compare string, to avoid hash collisions */
+			if (!strcmp(key, d->key[i])) {
+				/* Found key */
+				break;
+			}
+		}
+	}
+	if (i >= d->size)
+		/* Key not found */
+		return;
+
+	free(d->key[i]);
+	d->key[i] = NULL;
+	if (d->val[i]!=NULL) {
+		free(d->val[i]);
+		d->val[i] = NULL;
+	}
+	d->hash[i] = 0;
+	d->n --;
+	return;
+}
+
+void dictionary_dump(dictionary *d, FILE *out)
+{
+	int i;
+
+	if (d == NULL || out == NULL)
+		return;
+	if (d->n < 1) {
+		fprintf(out, "empty dictionary\n");
+		return;
+	}
+	for (i = 0; i < d->size; i++) {
+		if (d->key[i]) {
+			fprintf(out, "%20s\t[%s]\n",
+				d->key[i],
+				d->val[i] ? d->val[i] : "UNDEF");
+		}
+	}
+	return;
+}
+
+/** @}
+ */
diff --git a/ccan/ciniparser/dictionary.h b/ccan/ciniparser/dictionary.h
new file mode 100644
index 0000000..a94ea1a
--- /dev/null
+++ b/ccan/ciniparser/dictionary.h
@@ -0,0 +1,166 @@
+#ifndef _DICTIONARY_H_
+#define _DICTIONARY_H_
+
+/* Copyright (c) 2000-2007 by Nicolas Devillard.
+ * Copyright (x) 2009 by Tim Post <tinkertim@gmail.com>
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/** @addtogroup ciniparser
+ * @{
+ */
+/**
+ * @file    dictionary.h
+ * @author  N. Devillard
+ * @date    Sep 2007
+ * @version $Revision: 1.12 $
+ * @brief   Implements a dictionary for string variables.
+ *
+ * This module implements a simple dictionary object, i.e. a list
+ * of string/string associations. This object is useful to store e.g.
+ * information retrieved from a configuration file (ini files).
+ */
+
+
+/**
+ * @brief Dictionary object
+ * @param n Number of entries in the dictionary
+ * @param size Storage size
+ * @param val List of string values
+ * @param key List of string keys
+ * @param hash List of hash values for keys
+ *
+ * This object contains a list of string/string associations. Each
+ * association is identified by a unique string key. Looking up values
+ * in the dictionary is speeded up by the use of a (hopefully collision-free)
+ * hash function.
+ */
+typedef struct _dictionary_ {
+	int n;
+	int size;
+	char **val;
+	char **key;
+	unsigned *hash;
+} dictionary;
+
+/**
+ * @brief Compute the hash key for a string.
+ * @param key Character string to use for key.
+ * @return 1 unsigned int on at least 32 bits.
+ *
+ * This hash function has been taken from an Article in Dr Dobbs Journal.
+ * This is normally a collision-free function, distributing keys evenly.
+ * The key is stored anyway in the struct so that collision can be avoided
+ * by comparing the key itself in last resort.
+ */
+unsigned dictionary_hash(const char *key);
+
+/**
+ * @brief Create a new dictionary object.
+ * @param size Optional initial size of the dictionary.
+ * @return allocated dictionary object on success, NULL on failure
+ *
+ * This function allocates a new dictionary object of given size and returns
+ * it. If you do not know in advance (roughly) the number of entries in the
+ * dictionary, give size=0.
+ */
+dictionary *dictionary_new(int size);
+
+/**
+ * @brief Delete a dictionary object
+ * @param d dictionary object to deallocate.
+ * @return void
+ *
+ * Deallocate a dictionary object and all memory associated to it.
+ */
+void dictionary_del(dictionary *vd);
+
+/**
+ * @brief Get a value from a dictionary.
+ * @param d dictionary object to search.
+ * @param key Key to look for in the dictionary.
+ * @param def Default value to return if key not found.
+ * @return 1 pointer to internally allocated character string.
+ *
+ * This function locates a key in a dictionary and returns a pointer to its
+ * value, or the passed 'def' pointer if no such key can be found in
+ * dictionary. The returned character pointer points to data internal to the
+ * dictionary object, you should not try to free it or modify it.
+ */
+char *dictionary_get(dictionary *d, const char *key, char *def);
+
+/**
+ * @brief Set a value in a dictionary.
+ * @param d dictionary object to modify.
+ * @param key Key to modify or add.
+ * @param val Value to add.
+ * @return int 0 if Ok, anything else otherwise
+ *
+ * If the given key is found in the dictionary, the associated value is
+ * replaced by the provided one. If the key cannot be found in the
+ * dictionary, it is added to it.
+ *
+ * It is Ok to provide a NULL value for val, but NULL values for the dictionary
+ * or the key are considered as errors: the function will return immediately
+ * in such a case.
+ *
+ * Notice that if you dictionary_set a variable to NULL, a call to
+ * dictionary_get will return a NULL value: the variable will be found, and
+ * its value (NULL) is returned. In other words, setting the variable
+ * content to NULL is equivalent to deleting the variable from the
+ * dictionary. It is not possible (in this implementation) to have a key in
+ * the dictionary without value.
+ *
+ * This function returns non-zero in case of failure.
+ */
+int dictionary_set(dictionary *vd, const char *key, char *val);
+
+/**
+ * @brief Delete a key in a dictionary
+ * @param d dictionary object to modify.
+ * @param key Key to remove.
+ * @return void
+ *
+ * This function deletes a key in a dictionary. Nothing is done if the
+ * key cannot be found.
+ */
+void dictionary_unset(dictionary *d, const char *key);
+
+/**
+ * @brief Dump a dictionary to an opened file pointer.
+ * @param d Dictionary to dump
+ * @param out Opened file pointer
+ * @return void
+ *
+ * Dumps a dictionary onto an opened file pointer. Key pairs are printed out
+ * as @c [Key]=[Value], one per line. It is Ok to provide stdout or stderr as
+ * output file pointers.
+ */
+void dictionary_dump(dictionary *d, FILE *out);
+
+#endif
+/** @}
+ */
-- 
2.31.1

[ndctl PATCH 2/5] ndctl, util: add parse-configs helper

[QI Fuli]

From: QI Fuli <qi.fuli@fujitsu.com>

Add parse-config util to help ndctl commands parse ndctl global
configuration file(s).

Signed-off-by: QI Fuli <qi.fuli@fujitsu.com>
---
 Makefile.am          |  2 ++
 util/parse-configs.c | 82 ++++++++++++++++++++++++++++++++++++++++++++
 util/parse-configs.h | 34 ++++++++++++++++++
 3 files changed, 118 insertions(+)
 create mode 100644 util/parse-configs.c
 create mode 100644 util/parse-configs.h

diff --git a/Makefile.am b/Makefile.am
index 960b5e9..6e50741 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -74,6 +74,8 @@ noinst_LIBRARIES += libutil.a
 libutil_a_SOURCES = \
 	util/parse-options.c \
 	util/parse-options.h \
+	util/parse-configs.c \
+	util/parse-configs.h \
 	util/usage.c \
 	util/size.c \
 	util/main.c \
diff --git a/util/parse-configs.c b/util/parse-configs.c
new file mode 100644
index 0000000..b7ae1f0
--- /dev/null
+++ b/util/parse-configs.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2021, FUJITSU LIMITED. ALL rights reserved.
+
+#include <errno.h>
+#include <util/parse-configs.h>
+#include <util/strbuf.h>
+#include <ccan/ciniparser/ciniparser.h>
+
+static void set_str_val(const char **value, char *val)
+{
+	struct strbuf buf = STRBUF_INIT;
+	size_t len = *value ? strlen(*value) : 0;
+
+	if (!val)
+		return;
+
+	if (len) {
+		strbuf_add(&buf, *value, len);
+		strbuf_addstr(&buf, " ");
+	}
+	strbuf_addstr(&buf, val);
+	*value = strbuf_detach(&buf, NULL);
+}
+
+static int parse_config_file(const char *config_file,
+			const struct config *configs)
+{
+	dictionary *dic;
+
+	dic = ciniparser_load(config_file);
+	if (!dic)
+		return -errno;
+
+	for (; configs->type != CONFIG_END; configs++) {
+		switch (configs->type) {
+		case CONFIG_STRING:
+			set_str_val((const char **)configs->value,
+					ciniparser_getstring(dic,
+					configs->key, configs->defval));
+			break;
+		case MONITOR_CALLBACK:
+		case CONFIG_END:
+			break;
+		}
+	}
+
+	ciniparser_freedict(dic);
+	return 0;
+}
+
+int parse_configs_prefix(const char *__config_files, const char *prefix,
+				const struct config *configs)
+{
+	char *config_files, *save;
+	const char *config_file;
+	int rc;
+
+	config_files = strdup(__config_files);
+	if (!config_files)
+		return -ENOMEM;
+
+	for (config_file = strtok_r(config_files, " ", &save); config_file;
+				config_file = strtok_r(NULL, " ", &save)) {
+
+		if (strncmp(config_file, "./", 2) != 0)
+			fix_filename(prefix, &config_file);
+
+		if ((configs->type == MONITOR_CALLBACK) &&
+				(strcmp(config_file, configs->key) == 0))
+			rc = configs->callback(configs, configs->key);
+		else
+			rc = parse_config_file(config_file, configs);
+
+		if (rc)
+			goto end;
+	}
+
+ end:
+	free(config_files);
+	return rc;
+
+}
diff --git a/util/parse-configs.h b/util/parse-configs.h
new file mode 100644
index 0000000..f70f58f
--- /dev/null
+++ b/util/parse-configs.h
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2021, FUJITSU LIMITED. ALL rights reserved.
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <util/util.h>
+
+enum parse_conf_type {
+	CONFIG_STRING,
+	CONFIG_END,
+	MONITOR_CALLBACK,
+};
+
+struct config;
+typedef int parse_conf_cb(const struct config *, const char *config_file);
+
+struct config {
+	enum parse_conf_type type;
+	const char *key;
+	void *value;
+	void *defval;
+	parse_conf_cb *callback;
+};
+
+#define check_vtype(v, type) ( BUILD_BUG_ON_ZERO(!__builtin_types_compatible_p(typeof(v), type)) + v )
+
+#define CONF_END() { .type = CONFIG_END }
+#define CONF_STR(k,v,d) \
+	{ .type = CONFIG_STRING, .key = (k), .value = check_vtype(v, const char **), .defval = (d) }
+#define CONF_MONITOR(k,f) \
+	{ .type = MONITOR_CALLBACK, .key = (k), .callback = (f)}
+
+int parse_configs_prefix(const char *__config_file, const char *prefix,
+				const struct config *configs);
-- 
2.31.1

[ndctl PATCH 3/5] ndctl: make ndctl support configuration files

[QI Fuli]

From: QI Fuli <qi.fuli@fujitsu.com>

Add ndctl_configs to ndctl_ctx for supporting ndctl global configuration
files. All files with .conf suffix under {sysconfdir}/ndctl can be
regarded as global configuration files that all ndctl commands can refer
to. Add ndctl_set_configs() public function for setting ndctl default
configuration files. Add ndctl_get_configs() public function for reading
configuration files from ndctl_ctx.

Signed-off-by: QI Fuli <qi.fuli@fujitsu.com>
---
 configure.ac           |  4 ++--
 ndctl/Makefile.am      |  5 ++--
 ndctl/lib/Makefile.am  |  4 ++++
 ndctl/lib/libndctl.c   | 52 ++++++++++++++++++++++++++++++++++++++++++
 ndctl/lib/libndctl.sym |  2 ++
 ndctl/lib/private.h    |  1 +
 ndctl/libndctl.h       |  2 ++
 ndctl/ndctl.c          |  1 +
 8 files changed, 67 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index dc39dbe..42a66e1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -171,9 +171,9 @@ fi
 AC_SUBST([systemd_unitdir])
 AM_CONDITIONAL([ENABLE_SYSTEMD_UNITS], [test "x$with_systemd" = "xyes"])
 
-ndctl_monitorconfdir=${sysconfdir}/ndctl
+ndctl_confdir=${sysconfdir}/ndctl
 ndctl_monitorconf=monitor.conf
-AC_SUBST([ndctl_monitorconfdir])
+AC_SUBST([ndctl_confdir])
 AC_SUBST([ndctl_monitorconf])
 
 daxctl_modprobe_datadir=${datadir}/daxctl
diff --git a/ndctl/Makefile.am b/ndctl/Makefile.am
index a63b1e0..1caa031 100644
--- a/ndctl/Makefile.am
+++ b/ndctl/Makefile.am
@@ -7,8 +7,9 @@ BUILT_SOURCES = config.h
 config.h: $(srcdir)/Makefile.am
 	$(AM_V_GEN) echo "/* Autogenerated by ndctl/Makefile.am */" >$@ && \
 	echo '#define NDCTL_CONF_FILE \
-		"$(ndctl_monitorconfdir)/$(ndctl_monitorconf)"' >>$@
+		"$(ndctl_confdir)/$(ndctl_monitorconf)"' >>$@
 	$(AM_V_GEN) echo '#define NDCTL_KEYS_DIR  "$(ndctl_keysdir)"' >>$@
+	$(AM_V_GEN) echo '#define NDCTL_CONF_DIR  "$(ndctl_confdir)"' >>$@
 
 ndctl_SOURCES = ndctl.c \
 		builtin.h \
@@ -73,7 +74,7 @@ ndctl_SOURCES += ../test/libndctl.c \
 		 test.c
 endif
 
-monitor_configdir = $(ndctl_monitorconfdir)
+monitor_configdir = $(ndctl_confdir)
 monitor_config_DATA = $(ndctl_monitorconf)
 
 if ENABLE_SYSTEMD_UNITS
diff --git a/ndctl/lib/Makefile.am b/ndctl/lib/Makefile.am
index e15bb22..f741c44 100644
--- a/ndctl/lib/Makefile.am
+++ b/ndctl/lib/Makefile.am
@@ -14,6 +14,10 @@ libndctl_la_SOURCES =\
 	../../util/log.h \
 	../../util/sysfs.c \
 	../../util/sysfs.h \
+	../../util/strbuf.h \
+	../../util/strbuf.c \
+	../../util/wrapper.c \
+	../../util/usage.c \
 	../../util/fletcher.h \
 	dimm.c \
 	inject.c \
diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c
index 536e142..db2e38b 100644
--- a/ndctl/lib/libndctl.c
+++ b/ndctl/lib/libndctl.c
@@ -24,6 +24,7 @@
 #include <util/util.h>
 #include <util/size.h>
 #include <util/sysfs.h>
+#include <util/strbuf.h>
 #include <ndctl/libndctl.h>
 #include <ndctl/namespace.h>
 #include <daxctl/libdaxctl.h>
@@ -265,6 +266,56 @@ NDCTL_EXPORT void ndctl_set_userdata(struct ndctl_ctx *ctx, void *userdata)
 	ctx->userdata = userdata;
 }
 
+static int filter_conf(const struct dirent *dir)
+{
+	if (!dir)
+		return 0;
+
+	if (dir->d_type == DT_REG) {
+		const char *ext = strrchr(dir->d_name, '.');
+		if ((!ext) || (ext == dir->d_name))
+			return 0;
+		if (strcmp(ext, ".conf") == 0)
+			return 1;
+	}
+
+	return 0;
+}
+
+NDCTL_EXPORT void ndctl_set_configs(struct ndctl_ctx **ctx, char *conf_dir)
+{
+	struct dirent **namelist;
+	struct strbuf value = STRBUF_INIT;
+	int rc;
+
+	if ((!ctx) || (!conf_dir))
+		return;
+
+	rc = scandir(conf_dir, &namelist, filter_conf, alphasort);
+	if (rc == -1) {
+		perror("scandir");
+		return;
+	}
+
+	while (rc--) {
+		if (value.len)
+			strbuf_addstr(&value, " ");
+		strbuf_addstr(&value, conf_dir);
+		strbuf_addstr(&value, "/");
+		strbuf_addstr(&value, namelist[rc]->d_name);
+		free(namelist[rc]);
+	}
+	(*ctx)->configs = strbuf_detach(&value, NULL);
+	free(namelist);
+}
+
+NDCTL_EXPORT const char *ndctl_get_configs(struct ndctl_ctx *ctx)
+{
+	if (ctx == NULL)
+		return NULL;
+	return ctx->configs;
+}
+
 /**
  * ndctl_new - instantiate a new library context
  * @ctx: context to establish
@@ -331,6 +382,7 @@ NDCTL_EXPORT int ndctl_new(struct ndctl_ctx **ctx)
 	c->daxctl_ctx = daxctl_ctx;
 
 	return 0;
+
  err_ctx:
 	daxctl_unref(daxctl_ctx);
  err_daxctl:
diff --git a/ndctl/lib/libndctl.sym b/ndctl/lib/libndctl.sym
index 58afb74..5bd867d 100644
--- a/ndctl/lib/libndctl.sym
+++ b/ndctl/lib/libndctl.sym
@@ -454,4 +454,6 @@ LIBNDCTL_25 {
 
 LIBNDCTL_26 {
 	ndctl_bus_nfit_translate_spa;
+	ndctl_set_configs;
+	ndctl_get_configs;
 } LIBNDCTL_25;
diff --git a/ndctl/lib/private.h b/ndctl/lib/private.h
index 8f4510e..f4ca71f 100644
--- a/ndctl/lib/private.h
+++ b/ndctl/lib/private.h
@@ -129,6 +129,7 @@ struct ndctl_ctx {
 	int regions_init;
 	void *userdata;
 	struct list_head busses;
+	const char *configs;
 	int busses_init;
 	struct udev *udev;
 	struct udev_queue *udev_queue;
diff --git a/ndctl/libndctl.h b/ndctl/libndctl.h
index 87d07b7..7ab7691 100644
--- a/ndctl/libndctl.h
+++ b/ndctl/libndctl.h
@@ -92,6 +92,8 @@ int ndctl_get_log_priority(struct ndctl_ctx *ctx);
 void ndctl_set_log_priority(struct ndctl_ctx *ctx, int priority);
 void ndctl_set_userdata(struct ndctl_ctx *ctx, void *userdata);
 void *ndctl_get_userdata(struct ndctl_ctx *ctx);
+void ndctl_set_configs(struct ndctl_ctx **ctx, char *conf_dir);
+const char *ndctl_get_configs(struct ndctl_ctx *ctx);
 
 enum ndctl_persistence_domain {
 	PERSISTENCE_NONE = 0,
diff --git a/ndctl/ndctl.c b/ndctl/ndctl.c
index 31d2c5e..0f00b04 100644
--- a/ndctl/ndctl.c
+++ b/ndctl/ndctl.c
@@ -125,6 +125,7 @@ int main(int argc, const char **argv)
 	rc = ndctl_new(&ctx);
 	if (rc)
 		goto out;
+	ndctl_set_configs(&ctx, NDCTL_CONF_DIR);
 	main_handle_internal_command(argc, argv, ctx, commands,
 			ARRAY_SIZE(commands), PROG_NDCTL);
 	ndctl_unref(ctx);
-- 
2.31.1

[ndctl PATCH 4/5] ndctl, config: add the default ndctl configuration file

[QI Fuli]

From: QI Fuli <qi.fuli@fujitsu.com>

Install ndctl/ndctl.conf as the default ndctl configuration file.

Signed-off-by: QI Fuli <qi.fuli@fujitsu.com>
---
 configure.ac      |  2 ++
 ndctl/Makefile.am |  4 +++-
 ndctl/ndctl.conf  | 56 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 ndctl/ndctl.conf

diff --git a/configure.ac b/configure.ac
index 42a66e1..9e1c6db 100644
--- a/configure.ac
+++ b/configure.ac
@@ -172,8 +172,10 @@ AC_SUBST([systemd_unitdir])
 AM_CONDITIONAL([ENABLE_SYSTEMD_UNITS], [test "x$with_systemd" = "xyes"])
 
 ndctl_confdir=${sysconfdir}/ndctl
+ndctl_conf=ndctl.conf
 ndctl_monitorconf=monitor.conf
 AC_SUBST([ndctl_confdir])
+AC_SUBST([ndctl_conf])
 AC_SUBST([ndctl_monitorconf])
 
 daxctl_modprobe_datadir=${datadir}/daxctl
diff --git a/ndctl/Makefile.am b/ndctl/Makefile.am
index 1caa031..fceb3ab 100644
--- a/ndctl/Makefile.am
+++ b/ndctl/Makefile.am
@@ -43,7 +43,7 @@ keys_configdir = $(ndctl_keysdir)
 keys_config_DATA = $(ndctl_keysreadme)
 endif
 
-EXTRA_DIST += keys.readme monitor.conf ndctl-monitor.service
+EXTRA_DIST += keys.readme monitor.conf ndctl-monitor.service ndctl.conf
 
 if ENABLE_DESTRUCTIVE
 ndctl_SOURCES += ../test/blk_namespaces.c \
@@ -74,6 +74,8 @@ ndctl_SOURCES += ../test/libndctl.c \
 		 test.c
 endif
 
+ndctl_configdir = $(ndctl_confdir)
+ndctl_config_DATA = $(ndctl_conf)
 monitor_configdir = $(ndctl_confdir)
 monitor_config_DATA = $(ndctl_monitorconf)
 
diff --git a/ndctl/ndctl.conf b/ndctl/ndctl.conf
new file mode 100644
index 0000000..4b3eb7e
--- /dev/null
+++ b/ndctl/ndctl.conf
@@ -0,0 +1,56 @@
+# This is the default ndctl configuration file. It contains the
+# configuration directives that give ndctl instructions.
+# Ndctl supports multiple configuration files. All files with the
+# .conf suffix under "sysconfdir/ndctl/" can be regarded as ndctl
+# configuration files.
+
+# In this file, lines starting with a hash (#) are comments.
+# The configurations should be in a [section] and follow <key> = <value>
+# style. Multiple space-separated values are allowed, but except the
+# following characters: : ? / \ % " ' $ & ! * { } [ ] ( ) = < > @
+
+[core]
+# The values in [core] section work for all ndctl sub commands.
+# dimm = all
+# bus = all
+# region = all
+# namespace = all
+
+[monitor]
+# The values in [monitor] section work for ndctl monitor.
+# You can change the configuration of ndctl monitor by editing this
+# file or use [--config-file=<file>] option to override this one.
+# The changed value will work after restart ndctl monitor service.
+
+# The objects to monitor are filtered via dimm's name by setting key "dimm".
+# If this value is different from the value of [--dimm=<value>] option,
+# both of the values will work.
+# dimm = all
+
+# The objects to monitor are filtered via its parent bus by setting key "bus".
+# If this value is different from the value of [--bus=<value>] option,
+# both of the values will work.
+# bus = all
+
+# The objects to monitor are filtered via region by setting key "region".
+# If this value is different from the value of [--region=<value>] option,
+# both of the values will work.
+# region = all
+
+# The objects to monitor are filtered via namespace by setting key "namespace".
+# If this value is different from the value of [--namespace=<value>] option,
+# both of the values will work.
+# namespace = all
+
+# The DIMM events to monitor are filtered via event type by setting key
+# "dimm-event". If this value is different from the value of
+# [--dimm-event=<value>] option, both of the values will work.
+# dimm-event = all
+
+# Users can choose to output the notifications to syslog (log=syslog),
+# to standard output (log=standard) or to write into a special file (log=<file>)
+# by setting key "log". If this value is in conflict with the value of
+# [--log=<value>] option, this value will be ignored.
+# Note: Setting value to "standard" or relative path for <file> will not work
+# when running moniotr as a daemon.
+# log = /var/log/ndctl/monitor.log
-- 
2.31.1

[ndctl PATCH 5/5] ndctl, monitor: refactor monitor for supporting multiple config files

[QI Fuli]

From: QI Fuli <qi.fuli@fujitsu.com>

In order to support multiple configration files, refactor ndctl monitor
by using parse-configs helper. 

Signed-off-by: QI Fuli <qi.fuli@fujitsu.com>
---
 Documentation/ndctl/Makefile.am       |  2 +-
 Documentation/ndctl/ndctl-monitor.txt |  8 ++--
 ndctl/Makefile.am                     |  1 +
 ndctl/monitor.c                       | 69 ++++++++++++++-------------
 4 files changed, 42 insertions(+), 38 deletions(-)

diff --git a/Documentation/ndctl/Makefile.am b/Documentation/ndctl/Makefile.am
index f0d5b21..37855cc 100644
--- a/Documentation/ndctl/Makefile.am
+++ b/Documentation/ndctl/Makefile.am
@@ -59,7 +59,7 @@ CLEANFILES = $(man1_MANS)
 .ONESHELL:
 attrs.adoc: $(srcdir)/Makefile.am
 	$(AM_V_GEN) cat <<- EOF >$@
-		:ndctl_monitorconfdir: $(ndctl_monitorconfdir)
+		:ndctl_confdir: $(ndctl_confdir)
 		:ndctl_monitorconf: $(ndctl_monitorconf)
 		:ndctl_keysdir: $(ndctl_keysdir)
 		EOF
diff --git a/Documentation/ndctl/ndctl-monitor.txt b/Documentation/ndctl/ndctl-monitor.txt
index dbc9070..8c8c35b 100644
--- a/Documentation/ndctl/ndctl-monitor.txt
+++ b/Documentation/ndctl/ndctl-monitor.txt
@@ -21,8 +21,8 @@ objects and dumping the json format notifications to syslog, standard
 output or a logfile.
 
 The objects to monitor and smart events to notify can be selected by
-setting options and/or the configuration file at
-{ndctl_monitorconfdir}/{ndctl_monitorconf}
+setting options and/or configuration files with .conf suffix under
+{ndctl_confdir}
 
 Both, the values in configuration file and in options will work. If
 there is a conflict, the values in options will override the values in
@@ -81,8 +81,8 @@ will not work if "--daemon" is specified.
 
 -c::
 --config-file=::
-	Provide the config file to use. This overrides the default config
-	typically found in {ndctl_monitorconfdir}
+	Provide the config file(s) to use. This overrides the default config
+	typically found in {ndctl_confdir}
 
 --daemon::
 	Run a monitor as a daemon.
diff --git a/ndctl/Makefile.am b/ndctl/Makefile.am
index fceb3ab..3c59aa7 100644
--- a/ndctl/Makefile.am
+++ b/ndctl/Makefile.am
@@ -55,6 +55,7 @@ ndctl_LDADD =\
 	lib/libndctl.la \
 	../daxctl/lib/libdaxctl.la \
 	../libutil.a \
+	../libccan.a \
 	$(UUID_LIBS) \
 	$(KMOD_LIBS) \
 	$(JSON_LIBS)
diff --git a/ndctl/monitor.c b/ndctl/monitor.c
index ca36179..e944c90 100644
--- a/ndctl/monitor.c
+++ b/ndctl/monitor.c
@@ -10,6 +10,7 @@
 #include <util/filter.h>
 #include <util/util.h>
 #include <util/parse-options.h>
+#include <util/parse-configs.h>
 #include <util/strbuf.h>
 #include <ndctl/config.h>
 #include <ndctl/ndctl.h>
@@ -28,7 +29,7 @@
 
 static struct monitor {
 	const char *log;
-	const char *config_file;
+	const char *configs;
 	const char *dimm_event;
 	FILE *log_file;
 	bool daemon;
@@ -463,7 +464,7 @@ out:
 	return rc;
 }
 
-static void parse_config(const char **arg, char *key, char *val, char *ident)
+static void set_monitor_conf(const char **arg, char *key, char *val, char *ident)
 {
 	struct strbuf value = STRBUF_INIT;
 	size_t arg_len = *arg ? strlen(*arg) : 0;
@@ -479,39 +480,25 @@ static void parse_config(const char **arg, char *key, char *val, char *ident)
 	*arg = strbuf_detach(&value, NULL);
 }
 
-static int read_config_file(struct ndctl_ctx *ctx, struct monitor *_monitor,
-		struct util_filter_params *_param)
+static int parse_monitor_config(const struct config *configs,
+					const char *config_file)
 {
 	FILE *f;
 	size_t len = 0;
 	int line = 0, rc = 0;
-	char *buf = NULL, *seek, *value, *config_file;
-
-	if (_monitor->config_file)
-		config_file = strdup(_monitor->config_file);
-	else
-		config_file = strdup(NDCTL_CONF_FILE);
-	if (!config_file) {
-		fail("strdup default config file failed\n");
-		rc = -ENOMEM;
-		goto out;
-	}
+	char *buf = NULL, *seek, *value;
 
 	buf = malloc(BUF_SIZE);
 	if (!buf) {
 		fail("malloc read config-file buf error\n");
-		rc = -ENOMEM;
-		goto out;
+		return -ENOMEM;
 	}
 	seek = buf;
 
 	f = fopen(config_file, "r");
 	if (!f) {
-		if (_monitor->config_file) {
-			err(&monitor, "config-file: %s cannot be opened\n",
-				config_file);
-			rc = -errno;
-		}
+		err(&monitor, "%s cannot be opened\n", config_file);
+		rc = -errno;
 		goto out;
 	}
 
@@ -554,19 +541,18 @@ static int read_config_file(struct ndctl_ctx *ctx, struct monitor *_monitor,
 		if (len == 0)
 			continue;
 
-		parse_config(&_param->bus, "bus", value, seek);
-		parse_config(&_param->dimm, "dimm", value, seek);
-		parse_config(&_param->region, "region", value, seek);
-		parse_config(&_param->namespace, "namespace", value, seek);
-		parse_config(&_monitor->dimm_event, "dimm-event", value, seek);
+		set_monitor_conf(&param.bus, "bus", value, seek);
+		set_monitor_conf(&param.dimm, "dimm", value, seek);
+		set_monitor_conf(&param.region, "region", value, seek);
+		set_monitor_conf(&param.namespace, "namespace", value, seek);
+		set_monitor_conf(&monitor.dimm_event, "dimm-event", value, seek);
 
-		if (!_monitor->log)
-			parse_config(&_monitor->log, "log", value, seek);
+		if (!monitor.log)
+			set_monitor_conf(&monitor.log, "log", value, seek);
 	}
 	fclose(f);
 out:
 	free(buf);
-	free(config_file);
 	return rc;
 }
 
@@ -585,8 +571,8 @@ int cmd_monitor(int argc, const char **argv, struct ndctl_ctx *ctx)
 		OPT_FILENAME('l', "log", &monitor.log,
 				"<file> | syslog | standard",
 				"where to output the monitor's notification"),
-		OPT_FILENAME('c', "config-file", &monitor.config_file,
-				"config-file", "override the default config"),
+		OPT_STRING('c', "config-file", &monitor.configs,
+				"config-file", "override default configs"),
 		OPT_BOOLEAN('\0', "daemon", &monitor.daemon,
 				"run ndctl monitor as a daemon"),
 		OPT_BOOLEAN('u', "human", &monitor.human,
@@ -601,6 +587,19 @@ int cmd_monitor(int argc, const char **argv, struct ndctl_ctx *ctx)
 		"ndctl monitor [<options>]",
 		NULL
 	};
+	const struct config configs[] = {
+		CONF_MONITOR(NDCTL_CONF_FILE, parse_monitor_config),
+		CONF_STR("core:bus", &param.bus, NULL),
+		CONF_STR("core:region", &param.region, NULL),
+		CONF_STR("core:dimm", &param.dimm, NULL),
+		CONF_STR("core:namespace", &param.namespace, NULL),
+		CONF_STR("monitor:bus", &param.bus, NULL),
+		CONF_STR("monitor:region", &param.region, NULL),
+		CONF_STR("monitor:dimm", &param.dimm, NULL),
+		CONF_STR("monitor:namespace", &param.namespace, NULL),
+		CONF_STR("monitor:dimm-event", &monitor.dimm_event, NULL),
+		CONF_END(),
+	};
 	const char *prefix = "./";
 	struct util_filter_ctx fctx = { 0 };
 	struct monitor_filter_arg mfa = { 0 };
@@ -621,7 +620,11 @@ int cmd_monitor(int argc, const char **argv, struct ndctl_ctx *ctx)
 	else
 		monitor.ctx.log_priority = LOG_INFO;
 
-	rc = read_config_file(ctx, &monitor, &param);
+	if (monitor.configs)
+		rc = parse_configs_prefix(monitor.configs, prefix, configs);
+	else
+		rc = parse_configs_prefix(
+				ndctl_get_configs(ctx), prefix, configs);
 	if (rc)
 		goto out;
 
-- 
2.31.1

Re: [ndctl PATCH 1/5] ndctl, ccan: import ciniparser

[Dan Williams]

On Sun, Aug 22, 2021 at 1:36 PM QI Fuli <fukuri.sai@gmail.com> wrote:
>
> Import ciniparser from ccan[1].
> [1] https://ccodearchive.net/info/ciniparser.html

Hi Qi,

Vishal points out that an updated version of this code is now
available as a proper library that ships in distributions called
"iniparser".

Re: [ndctl PATCH 1/5] ndctl, ccan: import ciniparser

[Verma, Vishal L]

On Mon, 2021-08-23 at 09:48 -0700, Dan Williams wrote:
> On Sun, Aug 22, 2021 at 1:36 PM QI Fuli <fukuri.sai@gmail.com> wrote:
> > 
> > Import ciniparser from ccan[1].
> > [1] https://ccodearchive.net/info/ciniparser.html
> 
> Hi Qi,
> 
> Vishal points out that an updated version of this code is now
> available as a proper library that ships in distributions called
> "iniparser".
> 
Here is the link to the project - it seems like it is maintained by the
same person, just outside of ccan, and as a standalone project:

https://github.com/ndevilla/iniparser

RE: [ndctl PATCH 1/5] ndctl, ccan: import ciniparser

[qi.fuli]

> 
> On Mon, 2021-08-23 at 09:48 -0700, Dan Williams wrote:
> > On Sun, Aug 22, 2021 at 1:36 PM QI Fuli <fukuri.sai@gmail.com> wrote:
> > >
> > > Import ciniparser from ccan[1].
> > > [1] https://ccodearchive.net/info/ciniparser.html
> >
> > Hi Qi,
> >
> > Vishal points out that an updated version of this code is now
> > available as a proper library that ships in distributions called
> > "iniparser".
> >
> Here is the link to the project - it seems like it is maintained by the same person,
> just outside of ccan, and as a standalone project:
> 
> https://github.com/ndevilla/iniparser

Thank you for the information.
I will send an update patch set.

Qi