[PATCH 1/2] i2c-tools: Use getopt

[PATCH 1/2] i2c-tools: Use getopt

[Jean Delvare]

Use the standard C getopt() function instead of parsing the options
manually. The benefit of this move is that getopt() supports merged
flags (for example -fy instead of -f -y) and does not require options
to come first on the command line. As this is pretty standard by now,
not supporting such possibilities can confuse and disappoint the user.

Based on a preliminary patch from David Kerns.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
---
 tools/i2cdetect.c |   23 ++++++++++-------------
 tools/i2cdump.c   |   49 +++++++++++++++++++++++--------------------------
 tools/i2cget.c    |   31 ++++++++++++++-----------------
 tools/i2cset.c    |   45 +++++++++++++++++++--------------------------
 4 files changed, 66 insertions(+), 82 deletions(-)

--- i2c-tools.orig/tools/i2cdetect.c	2022-01-19 12:06:56.018443831 +0100
+++ i2c-tools/tools/i2cdetect.c	2022-05-06 15:22:27.631142241 +0200
@@ -205,12 +205,12 @@ int main(int argc, char *argv[])
 	unsigned long funcs;
 	int mode = MODE_AUTO;
 	int first = 0x08, last = 0x77;
-	int flags = 0;
+	int opt;
 	int yes = 0, version = 0, list = 0;
 
 	/* handle (optional) flags first */
-	while (1+flags < argc && argv[1+flags][0] == '-') {
-		switch (argv[1+flags][1]) {
+	while ((opt = getopt(argc, argv, "FValqry")) != -1) {
+		switch (opt) {
 		case 'V': version = 1; break;
 		case 'y': yes = 1; break;
 		case 'l': list = 1; break;
@@ -242,13 +242,10 @@ int main(int argc, char *argv[])
 			first = 0x00;
 			last = 0x7F;
 			break;
-		default:
-			fprintf(stderr, "Error: Unsupported option "
-				"\"%s\"!\n", argv[1+flags]);
+		case '?':
 			help();
 			exit(1);
 		}
-		flags++;
 	}
 
 	if (version) {
@@ -261,22 +258,22 @@ int main(int argc, char *argv[])
 		exit(0);
 	}
 
-	if (argc < flags + 2) {
+	if (argc < optind + 1) {
 		fprintf(stderr, "Error: No i2c-bus specified!\n");
 		help();
 		exit(1);
 	}
-	i2cbus = lookup_i2c_bus(argv[flags+1]);
+	i2cbus = lookup_i2c_bus(argv[optind]);
 	if (i2cbus < 0) {
 		help();
 		exit(1);
 	}
 
 	/* read address range if present */
-	if (argc == flags + 4 && mode != MODE_FUNC) {
+	if (argc == optind + 3 && mode != MODE_FUNC) {
 		int tmp;
 
-		tmp = strtol(argv[flags+2], &end, 0);
+		tmp = strtol(argv[optind+1], &end, 0);
 		if (*end) {
 			fprintf(stderr, "Error: FIRST argument not a "
 				"number!\n");
@@ -291,7 +288,7 @@ int main(int argc, char *argv[])
 		}
 		first = tmp;
 
-		tmp = strtol(argv[flags+3], &end, 0);
+		tmp = strtol(argv[optind+2], &end, 0);
 		if (*end) {
 			fprintf(stderr, "Error: LAST argument not a "
 				"number!\n");
@@ -305,7 +302,7 @@ int main(int argc, char *argv[])
 			exit(1);
 		}
 		last = tmp;
-	} else if (argc != flags + 2) {
+	} else if (argc != optind + 1) {
 		help();
 		exit(1);
 	}
--- i2c-tools.orig/tools/i2cdump.c	2021-07-22 16:39:29.619547310 +0200
+++ i2c-tools/tools/i2cdump.c	2022-05-06 15:27:20.168698719 +0200
@@ -110,26 +110,23 @@ int main(int argc, char *argv[])
 	char filename[20];
 	int block[256];
 	int pec = 0, even = 0;
-	int flags = 0;
+	int opt;
 	int force = 0, yes = 0, version = 0, all_addrs = 0;
 	const char *range = NULL;
 	int first = 0x00, last = 0xff;
 
 	/* handle (optional) flags first */
-	while (1+flags < argc && argv[1+flags][0] == '-') {
-		switch (argv[1+flags][1]) {
+	while ((opt = getopt(argc, argv, "Vafr:y")) != -1) {
+		switch (opt) {
 		case 'V': version = 1; break;
 		case 'f': force = 1; break;
-		case 'r': range = argv[1+(++flags)]; break;
+		case 'r': range = optarg; break;
 		case 'y': yes = 1; break;
 		case 'a': all_addrs = 1; break;
-		default:
-			fprintf(stderr, "Error: Unsupported option "
-				"\"%s\"!\n", argv[1+flags]);
+		case '?':
 			help();
 			exit(1);
 		}
-		flags++;
 	}
 
 	if (version) {
@@ -137,48 +134,48 @@ int main(int argc, char *argv[])
 		exit(0);
 	}
 
-	if (argc < flags + 2) {
+	if (argc < optind + 1) {
 		fprintf(stderr, "Error: No i2c-bus specified!\n");
 		help();
 		exit(1);
 	}
-	i2cbus = lookup_i2c_bus(argv[flags+1]);
+	i2cbus = lookup_i2c_bus(argv[optind]);
 	if (i2cbus < 0) {
 		help();
 		exit(1);
 	}
 
-	if (argc < flags + 3) {
+	if (argc < optind + 2) {
 		fprintf(stderr, "Error: No address specified!\n");
 		help();
 		exit(1);
 	}
-	address = parse_i2c_address(argv[flags+2], all_addrs);
+	address = parse_i2c_address(argv[optind+1], all_addrs);
 	if (address < 0) {
 		help();
 		exit(1);
 	}
 
-	if (argc < flags + 4) {
+	if (argc < optind + 3) {
 		fprintf(stderr, "No size specified (using byte-data access)\n");
 		size = I2C_SMBUS_BYTE_DATA;
-	} else if (!strncmp(argv[flags+3], "b", 1)) {
+	} else if (!strncmp(argv[optind+2], "b", 1)) {
 		size = I2C_SMBUS_BYTE_DATA;
-		pec = argv[flags+3][1] == 'p';
-	} else if (!strncmp(argv[flags+3], "w", 1)) {
+		pec = argv[optind+2][1] == 'p';
+	} else if (!strncmp(argv[optind+2], "w", 1)) {
 		size = I2C_SMBUS_WORD_DATA;
-		pec = argv[flags+3][1] == 'p';
-	} else if (!strncmp(argv[flags+3], "W", 1)) {
+		pec = argv[optind+2][1] == 'p';
+	} else if (!strncmp(argv[optind+2], "W", 1)) {
 		size = I2C_SMBUS_WORD_DATA;
 		even = 1;
-	} else if (!strncmp(argv[flags+3], "s", 1)) {
+	} else if (!strncmp(argv[optind+2], "s", 1)) {
 		fprintf(stderr,
 			"SMBus block mode is no longer supported, please use i2cget instead\n");
 		exit(1);
-	} else if (!strncmp(argv[flags+3], "c", 1)) {
+	} else if (!strncmp(argv[optind+2], "c", 1)) {
 		size = I2C_SMBUS_BYTE;
-		pec = argv[flags+3][1] == 'p';
-	} else if (!strcmp(argv[flags+3], "i"))
+		pec = argv[optind+2][1] == 'p';
+	} else if (!strcmp(argv[optind+2], "i"))
 		size = I2C_SMBUS_I2C_BLOCK_DATA;
 	else {
 		fprintf(stderr, "Error: Invalid mode!\n");
@@ -186,8 +183,8 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
-	if (argc > flags + 4) {
-		bank = strtol(argv[flags+4], &end, 0);
+	if (argc > optind + 3) {
+		bank = strtol(argv[optind+3], &end, 0);
 		if (*end || size == I2C_SMBUS_I2C_BLOCK_DATA) {
 			fprintf(stderr, "Error: Invalid bank number!\n");
 			help();
@@ -200,8 +197,8 @@ int main(int argc, char *argv[])
 			exit(1);
 		}
 
-		if (argc > flags + 5) {
-			bankreg = strtol(argv[flags+5], &end, 0);
+		if (argc > optind + 4) {
+			bankreg = strtol(argv[optind+4], &end, 0);
 			if (*end) {
 				fprintf(stderr, "Error: Invalid bank register "
 					"number!\n");
--- i2c-tools.orig/tools/i2cget.c	2022-05-06 10:17:28.301368522 +0200
+++ i2c-tools/tools/i2cget.c	2022-05-06 10:18:28.780137643 +0200
@@ -180,25 +180,22 @@ int main(int argc, char *argv[])
 	int daddress;
 	char filename[20];
 	int pec = 0;
-	int flags = 0;
+	int opt;
 	int force = 0, yes = 0, version = 0, all_addrs = 0;
 	int length;
 	unsigned char block_data[I2C_SMBUS_BLOCK_MAX];
 
 	/* handle (optional) flags first */
-	while (1+flags < argc && argv[1+flags][0] == '-') {
-		switch (argv[1+flags][1]) {
+	while ((opt = getopt(argc, argv, "Vafy")) != -1) {
+		switch (opt) {
 		case 'V': version = 1; break;
 		case 'f': force = 1; break;
 		case 'y': yes = 1; break;
 		case 'a': all_addrs = 1; break;
-		default:
-			fprintf(stderr, "Error: Unsupported option "
-				"\"%s\"!\n", argv[1+flags]);
+		case '?':
 			help();
 			exit(1);
 		}
-		flags++;
 	}
 
 	if (version) {
@@ -206,20 +203,20 @@ int main(int argc, char *argv[])
 		exit(0);
 	}
 
-	if (argc < flags + 3)
+	if (argc < optind + 2)
 		help();
 
-	i2cbus = lookup_i2c_bus(argv[flags+1]);
+	i2cbus = lookup_i2c_bus(argv[optind]);
 	if (i2cbus < 0)
 		help();
 
-	address = parse_i2c_address(argv[flags+2], all_addrs);
+	address = parse_i2c_address(argv[optind+1], all_addrs);
 	if (address < 0)
 		help();
 
-	if (argc > flags + 3) {
+	if (argc > optind + 2) {
 		size = I2C_SMBUS_BYTE_DATA;
-		daddress = strtol(argv[flags+3], &end, 0);
+		daddress = strtol(argv[optind+2], &end, 0);
 		if (*end || daddress < 0 || daddress > 0xff) {
 			fprintf(stderr, "Error: Data address invalid!\n");
 			help();
@@ -229,8 +226,8 @@ int main(int argc, char *argv[])
 		daddress = -1;
 	}
 
-	if (argc > flags + 4) {
-		switch (argv[flags+4][0]) {
+	if (argc > optind + 3) {
+		switch (argv[optind+3][0]) {
 		case 'b': size = I2C_SMBUS_BYTE_DATA; break;
 		case 'w': size = I2C_SMBUS_WORD_DATA; break;
 		case 'c': size = I2C_SMBUS_BYTE; break;
@@ -240,19 +237,19 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "Error: Invalid mode!\n");
 			help();
 		}
-		pec = argv[flags+4][1] == 'p';
+		pec = argv[optind+3][1] == 'p';
 		if (size == I2C_SMBUS_I2C_BLOCK_DATA && pec) {
 			fprintf(stderr, "Error: PEC not supported for I2C block data!\n");
 			help();
 		}
 	}
 
-	if (argc > flags + 5) {
+	if (argc > optind + 4) {
 		if (size != I2C_SMBUS_I2C_BLOCK_DATA) {
 			fprintf(stderr, "Error: Length only valid for I2C block data!\n");
 			help();
 		}
-		length = strtol(argv[flags+5], &end, 0);
+		length = strtol(argv[optind+4], &end, 0);
 		if (*end || length < 1 || length > I2C_SMBUS_BLOCK_MAX) {
 			fprintf(stderr, "Error: Length invalid!\n");
 			help();
--- i2c-tools.orig/tools/i2cset.c	2020-09-17 14:29:28.279299308 +0200
+++ i2c-tools/tools/i2cset.c	2022-05-06 15:17:28.593522601 +0200
@@ -162,31 +162,24 @@ int main(int argc, char *argv[])
 	int value, daddress, vmask = 0;
 	char filename[20];
 	int pec = 0;
-	int flags = 0;
+	int opt;
 	int force = 0, yes = 0, version = 0, readback = 0, all_addrs = 0;
 	unsigned char block[I2C_SMBUS_BLOCK_MAX];
 	int len;
 
 	/* handle (optional) flags first */
-	while (1+flags < argc && argv[1+flags][0] == '-') {
-		switch (argv[1+flags][1]) {
+	while ((opt = getopt(argc, argv, "Vafm:ry")) != -1) {
+		switch (opt) {
 		case 'V': version = 1; break;
 		case 'f': force = 1; break;
 		case 'y': yes = 1; break;
-		case 'm':
-			if (2+flags < argc)
-				maskp = argv[2+flags];
-			flags++;
-			break;
+		case 'm': maskp = optarg; break;
 		case 'r': readback = 1; break;
 		case 'a': all_addrs = 1; break;
-		default:
-			fprintf(stderr, "Error: Unsupported option "
-				"\"%s\"!\n", argv[1+flags]);
+		case '?':
 			help();
 			exit(1);
 		}
-		flags++;
 	}
 
 	if (version) {
@@ -194,33 +187,33 @@ int main(int argc, char *argv[])
 		exit(0);
 	}
 
-	if (argc < flags + 4)
+	if (argc < optind + 3)
 		help();
 
-	i2cbus = lookup_i2c_bus(argv[flags+1]);
+	i2cbus = lookup_i2c_bus(argv[optind]);
 	if (i2cbus < 0)
 		help();
 
-	address = parse_i2c_address(argv[flags+2], all_addrs);
+	address = parse_i2c_address(argv[optind+1], all_addrs);
 	if (address < 0)
 		help();
 
-	daddress = strtol(argv[flags+3], &end, 0);
+	daddress = strtol(argv[optind+2], &end, 0);
 	if (*end || daddress < 0 || daddress > 0xff) {
 		fprintf(stderr, "Error: Data address invalid!\n");
 		help();
 	}
 
 	/* check for command/mode */
-	if (argc == flags + 4) {
+	if (argc == optind + 3) {
 		/* Implicit "c" */
 		size = I2C_SMBUS_BYTE;
-	} else if (argc == flags + 5) {
+	} else if (argc == optind + 4) {
 		/* "c", "cp",  or implicit "b" */
-		if (!strcmp(argv[flags+4], "c")
-		 || !strcmp(argv[flags+4], "cp")) {
+		if (!strcmp(argv[optind+3], "c")
+		 || !strcmp(argv[optind+3], "cp")) {
 			size = I2C_SMBUS_BYTE;
-			pec = argv[flags+4][1] == 'p';
+			pec = argv[optind+3][1] == 'p';
 		} else {
 			size = I2C_SMBUS_BYTE_DATA;
 		}
@@ -250,11 +243,11 @@ int main(int argc, char *argv[])
 				fprintf(stderr, "Error: Mask not supported for block writes!\n");
 				help();
 			}
-			if (argc > (int)sizeof(block) + flags + 5) {
+			if (argc > (int)sizeof(block) + optind + 4) {
 				fprintf(stderr, "Error: Too many arguments!\n");
 				help();
 			}
-		} else if (argc != flags + 6) {
+		} else if (argc != optind + 5) {
 			fprintf(stderr, "Error: Too many arguments!\n");
 			help();
 		}
@@ -270,7 +263,7 @@ int main(int argc, char *argv[])
 		break;
 	case I2C_SMBUS_BYTE_DATA:
 	case I2C_SMBUS_WORD_DATA:
-		value = strtol(argv[flags+4], &end, 0);
+		value = strtol(argv[optind+3], &end, 0);
 		if (*end || value < 0) {
 			fprintf(stderr, "Error: Data value invalid!\n");
 			help();
@@ -283,8 +276,8 @@ int main(int argc, char *argv[])
 		break;
 	case I2C_SMBUS_BLOCK_DATA:
 	case I2C_SMBUS_I2C_BLOCK_DATA:
-		for (len = 0; len + flags + 5 < argc; len++) {
-			value = strtol(argv[flags + len + 4], &end, 0);
+		for (len = 0; len + optind + 4 < argc; len++) {
+			value = strtol(argv[optind + len + 3], &end, 0);
 			if (*end || value < 0) {
 				fprintf(stderr, "Error: Data value invalid!\n");
 				help();


-- 
Jean Delvare
SUSE L3 Support

[PATCH 2/2] i2c-tools: Implement and document option -h

[Jean Delvare]

Add an option -h to display the help of the tools. This is a common
practice so users may expect it to work.

Based on a preliminary patch from David Kerns.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
---
 tools/i2cdetect.8 |    6 ++++++
 tools/i2cdetect.c |    3 ++-
 tools/i2cdump.8   |    6 ++++++
 tools/i2cdump.c   |    3 ++-
 tools/i2cget.8    |    6 ++++++
 tools/i2cget.c    |    3 ++-
 tools/i2cset.8    |    6 ++++++
 tools/i2cset.c    |    3 ++-
 8 files changed, 32 insertions(+), 4 deletions(-)

--- i2c-tools.orig/tools/i2cdetect.8	2020-09-17 14:29:28.275299253 +0200
+++ i2c-tools/tools/i2cdetect.8	2022-05-06 16:00:21.370647957 +0200
@@ -18,6 +18,9 @@ i2cdetect \- detect I2C chips
 .I -V
 .br
 .B i2cdetect
+.I -h
+.br
+.B i2cdetect
 .I -l
 
 .SH DESCRIPTION
@@ -78,6 +81,9 @@ Display the list of functionalities impl
 .B "\-V"
 Display the version and exit.
 .TP
+.B "\-h"
+Display the help and exit.
+.TP
 .B "\-l"
 Output a list of installed busses.
 
--- i2c-tools.orig/tools/i2cdetect.c	2022-05-06 15:53:46.597938799 +0200
+++ i2c-tools/tools/i2cdetect.c	2022-05-06 16:00:48.922977347 +0200
@@ -242,9 +242,10 @@ int main(int argc, char *argv[])
 			first = 0x00;
 			last = 0x7F;
 			break;
+		case 'h':
 		case '?':
 			help();
-			exit(1);
+			exit(opt == '?');
 		}
 	}
 
--- i2c-tools.orig/tools/i2cdump.8	2021-07-22 16:39:29.619547310 +0200
+++ i2c-tools/tools/i2cdump.8	2022-05-06 15:59:58.930379681 +0200
@@ -14,6 +14,9 @@ i2cdump \- examine I2C registers
 .br
 .B i2cdump
 .B -V
+.br
+.B i2cdump
+.B -h
 
 .SH DESCRIPTION
 i2cdump is a small helper program to examine registers
@@ -24,6 +27,9 @@ visible through the I2C bus.
 .B -V
 Display the version and exit.
 .TP
+.B -h
+Display the help and exit.
+.TP
 .B -f
 Force access to the device even if it is already busy. By default, i2cdump
 will refuse to access a device which is already under the control of a
--- i2c-tools.orig/tools/i2cdump.c	2022-05-06 15:53:46.599938823 +0200
+++ i2c-tools/tools/i2cdump.c	2022-05-06 16:00:53.196028432 +0200
@@ -123,9 +123,10 @@ int main(int argc, char *argv[])
 		case 'r': range = optarg; break;
 		case 'y': yes = 1; break;
 		case 'a': all_addrs = 1; break;
+		case 'h':
 		case '?':
 			help();
-			exit(1);
+			exit(opt == '?');
 		}
 	}
 
--- i2c-tools.orig/tools/i2cget.8	2022-05-03 08:04:39.334978310 +0200
+++ i2c-tools/tools/i2cget.8	2022-05-06 15:58:15.488144365 +0200
@@ -13,6 +13,9 @@ i2cget \- read from I2C/SMBus chip regis
 .br
 .B i2cget
 .B -V
+.br
+.B i2cget
+.B -h
 
 .SH DESCRIPTION
 i2cget is a small helper program to read registers visible through the I2C
@@ -23,6 +26,9 @@ bus (or SMBus).
 .B -V
 Display the version and exit.
 .TP
+.B -h
+Display the help and exit.
+.TP
 .B -f
 Force access to the device even if it is already busy. By default, i2cget
 will refuse to access a device which is already under the control of a
--- i2c-tools.orig/tools/i2cget.c	2022-05-06 15:53:46.600938834 +0200
+++ i2c-tools/tools/i2cget.c	2022-05-06 16:00:55.894060687 +0200
@@ -192,9 +192,10 @@ int main(int argc, char *argv[])
 		case 'f': force = 1; break;
 		case 'y': yes = 1; break;
 		case 'a': all_addrs = 1; break;
+		case 'h':
 		case '?':
 			help();
-			exit(1);
+			exit(opt == '?');
 		}
 	}
 
--- i2c-tools.orig/tools/i2cset.8	2020-09-17 14:29:28.278299294 +0200
+++ i2c-tools/tools/i2cset.8	2022-05-06 15:58:41.228451225 +0200
@@ -18,6 +18,9 @@ i2cset \- set I2C registers
 .br
 .B i2cset
 .B -V
+.br
+.B i2cset
+.B -h
 
 .SH DESCRIPTION
 i2cset is a small helper program to set registers visible through the I2C
@@ -28,6 +31,9 @@ bus.
 .B -V
 Display the version and exit.
 .TP
+.B -h
+Display the help and exit.
+.TP
 .B -f
 Force access to the device even if it is already busy. By default, i2cset
 will refuse to access a device which is already under the control of a
--- i2c-tools.orig/tools/i2cset.c	2022-05-06 15:53:46.600938834 +0200
+++ i2c-tools/tools/i2cset.c	2022-05-06 16:00:43.398911306 +0200
@@ -176,9 +176,10 @@ int main(int argc, char *argv[])
 		case 'm': maskp = optarg; break;
 		case 'r': readback = 1; break;
 		case 'a': all_addrs = 1; break;
+		case 'h':
 		case '?':
 			help();
-			exit(1);
+			exit(opt == '?');
 		}
 	}
 

-- 
Jean Delvare
SUSE L3 Support

Re: [PATCH 1/2] i2c-tools: Use getopt

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 359 bytes --]


>  tools/i2cdetect.c |   23 ++++++++++-------------
>  tools/i2cdump.c   |   49 +++++++++++++++++++++++--------------------------
>  tools/i2cget.c    |   31 ++++++++++++++-----------------
>  tools/i2cset.c    |   45 +++++++++++++++++++--------------------------

Yeah, useful change for sure! Any chance to tackle i2ctransfer as well
while you are at it?


[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]

Re: [PATCH 1/2] i2c-tools: Use getopt

[Jean Delvare]

Hi Wolfram,

On Fri, 6 May 2022 16:45:17 +0200, Wolfram Sang wrote:
> >  tools/i2cdetect.c |   23 ++++++++++-------------
> >  tools/i2cdump.c   |   49 +++++++++++++++++++++++--------------------------
> >  tools/i2cget.c    |   31 ++++++++++++++-----------------
> >  tools/i2cset.c    |   45 +++++++++++++++++++--------------------------  
> 
> Yeah, useful change for sure! Any chance to tackle i2ctransfer as well
> while you are at it?

I did not want to step on your toes ;-) I'll look into applying the
same changes to i2ctransfer if possible, no problem.

-- 
Jean Delvare
SUSE L3 Support

Re: [PATCH 1/2] i2c-tools: Use getopt

[Wolfram Sang]

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Hi Jean,

> I did not want to step on your toes ;-) I'll look into applying the
> same changes to i2ctransfer if possible, no problem.

Thank you, much appreciated! My toes are far away tackling other
problems currently ;)

All the best,

   Wolfram


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