[PATCH v3 0/6] i2cset changes

[PATCH v3 0/6] i2cset changes

[Guenter Roeck]

The following series of patches removes the obsolete means to specify the value mask,
improves parameter error detection for the i2cset command, and cleans up the code a bit.

Note: Patch revision in headline was updated only if the individual patch is either new
or was changed.

v2:
- Split single patch into multiple individual patches
- Included code review feedback

v3:
- For block commands, check for number of arguments only after checking if pec
  is supported.
- Report "Too many arguments" instead of "Bad number of arguments".
- Committed blank replacement patch separately
- Check valid range for data value mask (patch #6)

[PATCH v2 1/6] i2cset: Remove deprecated method to provide the value mask

[Guenter Roeck]

The old method to provide the value mask has long since been deprecated,
remove it.
---
 CHANGES        |    1 +
 tools/i2cset.c |   12 ------------
 2 files changed, 1 insertions(+), 12 deletions(-)

diff --git a/CHANGES b/CHANGES
index 5aee418..999ff26 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,7 @@ i2c-tools CHANGES
 SVN
   i2c-dev.h: Make value arrays const for block write functions
   i2cset: Add support for SMBus and I2C block writes
+          Remove obsolete means to specify value mask
 
 3.0.3 (2010-12-12)
   Makefile: Let the environment set CC and CFLAGS
diff --git a/tools/i2cset.c b/tools/i2cset.c
index 6195633..e47c9d4 100644
--- a/tools/i2cset.c
+++ b/tools/i2cset.c
@@ -265,18 +265,6 @@ int main(int argc, char *argv[])
 		pec = argv[flags+5][1] == 'p';
 	}
 
-	/* Old method to provide the value mask, deprecated and no longer
-	   documented but still supported for compatibility */
-	if (argc > flags + 6) {
-		if (maskp) {
-			fprintf(stderr, "Error: Data value mask provided twice!\n");
-			help();
-		}
-		fprintf(stderr, "Warning: Using deprecated way to set the data value mask!\n");
-		fprintf(stderr, "         Please switch to using -m.\n");
-		maskp = argv[flags+6];
-	}
-
 	if (maskp) {
 		vmask = strtol(maskp, &end, 0);
 		if (*end || vmask == 0) {
-- 
1.7.0.4

[PATCH v3 2/6] i2cset: Check number of arguments for block data writes

[Guenter Roeck]

Signed-off-by: Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
---
 tools/i2cset.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/tools/i2cset.c b/tools/i2cset.c
index e47c9d4..e835465 100644
--- a/tools/i2cset.c
+++ b/tools/i2cset.c
@@ -223,7 +223,11 @@ int main(int argc, char *argv[])
 				fprintf(stderr, "Error: PEC not supported for I2C block writes!\n");
 				help();
 			}
-			for (len = 0; len < (int)sizeof(block) && len + flags + 5 < argc; len++) {
+			if (argc > (int)sizeof(block) + flags + 5) {
+				fprintf(stderr, "Error: Too many arguments!\n");
+				help();
+			}
+			for (len = 0; len + flags + 5 < argc; len++) {
 				value = strtol(argv[flags + len + 4], &end, 0);
 				if (*end || value < 0 || value > 0xff) {
                                 	fprintf(stderr, "Error: Block data value invalid!\n");
-- 
1.7.0.4

[PATCH v2 3/6] i2cset: Abort if value mask is set for block commands

[Guenter Roeck]

Specifying the value mask is not supported for block commands,
abort if it is specified anyway.

Signed-off-by: Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
---
 tools/i2cset.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/tools/i2cset.c b/tools/i2cset.c
index e835465..7750c03 100644
--- a/tools/i2cset.c
+++ b/tools/i2cset.c
@@ -223,6 +223,10 @@ int main(int argc, char *argv[])
 				fprintf(stderr, "Error: PEC not supported for I2C block writes!\n");
 				help();
 			}
+			if (maskp) {
+				fprintf(stderr, "Error: Mask not supported for block writes!\n");
+				help();
+			}
 			if (argc > (int)sizeof(block) + flags + 5) {
 				fprintf(stderr, "Error: Too many arguments!\n");
 				help();
-- 
1.7.0.4

[PATCH v3 4/6] i2cset: Ensure that there is no junk after the command/mode parameter

[Guenter Roeck]

Since the value mask can no longer be set after the mode command,
we can make sure that there is no junk after the command/mode
parameter in the command line.

Signed-off-by: Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
---
 CHANGES        |    1 +
 tools/i2cset.c |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/CHANGES b/CHANGES
index 999ff26..1ffe18f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,7 @@ SVN
   i2c-dev.h: Make value arrays const for block write functions
   i2cset: Add support for SMBus and I2C block writes
           Remove obsolete means to specify value mask
+          More stringent parameter validation
 
 3.0.3 (2010-12-12)
   Makefile: Let the environment set CC and CFLAGS
diff --git a/tools/i2cset.c b/tools/i2cset.c
index 7750c03..a45a829 100644
--- a/tools/i2cset.c
+++ b/tools/i2cset.c
@@ -240,6 +240,9 @@ int main(int argc, char *argv[])
 				block[len] = value;
 			}
 			goto dofile;
+		} else if (argc != flags + 6) {
+			fprintf(stderr, "Error: Too many arguments!\n");
+			help();
 		}
 	}
 
-- 
1.7.0.4

[PATCH v2 5/6] i2cset: Get command/mode before reading data

[Guenter Roeck]

Get and validate the command/mode parameter for all commands
before reading and evaluating actual data.

Signed-off-by: Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
---
 tools/i2cset.c |   99 +++++++++++++++++++++++++++++++-------------------------
 1 files changed, 55 insertions(+), 44 deletions(-)

diff --git a/tools/i2cset.c b/tools/i2cset.c
index a45a829..ed6ada2 100644
--- a/tools/i2cset.c
+++ b/tools/i2cset.c
@@ -207,18 +207,37 @@ int main(int argc, char *argv[])
 		help();
 	}
 
-	/* check for block data */
-	len = 0;
-	if (argc > flags + 5) {
+	/* check for command/mode */
+	if (argc == flags + 4) {
+		/* Implicit "c" */
+		size = I2C_SMBUS_BYTE;
+	} else if (argc == flags + 5) {
+		/* "c", "cp",  or implicit "b" */
+		if (!strcmp(argv[flags+4], "c")
+		 || !strcmp(argv[flags+4], "cp")) {
+			size = I2C_SMBUS_BYTE;
+			pec = argv[flags+4][1] == 'p';
+		} else {
+			size = I2C_SMBUS_BYTE_DATA;
+		}
+	} else {
+		/* All other commands */
+		if (strlen(argv[argc-1]) > 2
+		    || (strlen(argv[argc-1]) == 2 && argv[argc-1][1] != 'p')) {
+			fprintf(stderr, "Error: Invalid mode '%s'!\n", argv[argc-1]);
+			help();
+		}
 		switch (argv[argc-1][0]) {
+		case 'b': size = I2C_SMBUS_BYTE_DATA; break;
+		case 'w': size = I2C_SMBUS_WORD_DATA; break;
 		case 's': size = I2C_SMBUS_BLOCK_DATA; break;
 		case 'i': size = I2C_SMBUS_I2C_BLOCK_DATA; break;
 		default:
-			size = 0;
-			break;
+			fprintf(stderr, "Error: Invalid mode '%s'!\n", argv[argc-1]);
+			help();
 		}
+		pec = argv[argc-1][1] == 'p';
 		if (size == I2C_SMBUS_BLOCK_DATA || size == I2C_SMBUS_I2C_BLOCK_DATA) {
-			pec = argv[argc-1][1] == 'p';
 			if (pec && size == I2C_SMBUS_I2C_BLOCK_DATA) {
 				fprintf(stderr, "Error: PEC not supported for I2C block writes!\n");
 				help();
@@ -231,49 +250,48 @@ int main(int argc, char *argv[])
 				fprintf(stderr, "Error: Too many arguments!\n");
 				help();
 			}
-			for (len = 0; len + flags + 5 < argc; len++) {
-				value = strtol(argv[flags + len + 4], &end, 0);
-				if (*end || value < 0 || value > 0xff) {
-                                	fprintf(stderr, "Error: Block data value invalid!\n");
-                                	help();
-                        	}
-				block[len] = value;
-			}
-			goto dofile;
 		} else if (argc != flags + 6) {
 			fprintf(stderr, "Error: Too many arguments!\n");
 			help();
 		}
 	}
 
-	if (argc > flags + 4) {
-		if (!strcmp(argv[flags+4], "c")
-		 || !strcmp(argv[flags+4], "cp")) {
-			size = I2C_SMBUS_BYTE;
-			value = -1;
-			pec = argv[flags+4][1] == 'p';
-		} else {
-			size = I2C_SMBUS_BYTE_DATA;
-			value = strtol(argv[flags+4], &end, 0);
+	len = 0; /* Must always initialize len since it is passed to confirm() */
+
+	/* read values from command line */
+	switch (size) {
+	case I2C_SMBUS_BYTE_DATA:
+	case I2C_SMBUS_WORD_DATA:
+		value = strtol(argv[flags+4], &end, 0);
+		if (*end || value < 0) {
+			fprintf(stderr, "Error: Data value invalid!\n");
+			help();
+		}
+		if ((size == I2C_SMBUS_BYTE_DATA && value > 0xff)
+		    || (size == I2C_SMBUS_WORD_DATA && value > 0xffff)) {
+			fprintf(stderr, "Error: Data value out of range!\n");
+			help();
+		}
+		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);
 			if (*end || value < 0) {
 				fprintf(stderr, "Error: Data value invalid!\n");
 				help();
 			}
+			if (value > 0xff) {
+				fprintf(stderr, "Error: Data value out of range!\n");
+				help();
+			}
+			block[len] = value;
 		}
-	} else {
-		size = I2C_SMBUS_BYTE;
 		value = -1;
-	}
-
-	if (argc > flags + 5) {
-		switch (argv[flags+5][0]) {
-		case 'b': size = I2C_SMBUS_BYTE_DATA; break;
-		case 'w': size = I2C_SMBUS_WORD_DATA; break;
-		default:
-			fprintf(stderr, "Error: Invalid mode!\n");
-			help();
-		}
-		pec = argv[flags+5][1] == 'p';
+		break;
+	default:
+		value = -1;
+		break;
 	}
 
 	if (maskp) {
@@ -284,13 +302,6 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	if ((size == I2C_SMBUS_BYTE_DATA && value > 0xff)
-	 || (size == I2C_SMBUS_WORD_DATA && value > 0xffff)) {
-		fprintf(stderr, "Error: Data value out of range!\n");
-		help();
-	}
-
-dofile:
 	file = open_i2c_dev(i2cbus, filename, sizeof(filename), 0);
 	if (file < 0
 	 || check_funcs(file, size, pec)
-- 
1.7.0.4

[PATCH v3 6/6] i2cset: Check range for data value mask

[Guenter Roeck]

Signed-off-by: Guenter Roeck <guenter.roeck-IzeFyvvaP7pWk0Htik3J/w@public.gmane.org>
---
 tools/i2cset.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/tools/i2cset.c b/tools/i2cset.c
index ed6ada2..b512081 100644
--- a/tools/i2cset.c
+++ b/tools/i2cset.c
@@ -300,6 +300,11 @@ int main(int argc, char *argv[])
 			fprintf(stderr, "Error: Data value mask invalid!\n");
 			help();
 		}
+		if (((size == I2C_SMBUS_BYTE || size == I2C_SMBUS_BYTE_DATA)
+		     && vmask > 0xff) || vmask > 0xffff) {
+			fprintf(stderr, "Error: Data value mask out of range!\n");
+			help();
+		}
 	}
 
 	file = open_i2c_dev(i2cbus, filename, sizeof(filename), 0);
-- 
1.7.0.4

Re: [PATCH v3 0/6] i2cset changes

[Jean Delvare]

On Mon, 14 Feb 2011 10:06:07 -0800, Guenter Roeck wrote:
> The following series of patches removes the obsolete means to specify the value mask,
> improves parameter error detection for the i2cset command, and cleans up the code a bit.
> 
> Note: Patch revision in headline was updated only if the individual patch is either new
> or was changed.
> 
> v2:
> - Split single patch into multiple individual patches
> - Included code review feedback
> 
> v3:
> - For block commands, check for number of arguments only after checking if pec
>   is supported.
> - Report "Too many arguments" instead of "Bad number of arguments".
> - Committed blank replacement patch separately
> - Check valid range for data value mask (patch #6)

This version looks pretty good, please commit. Thanks!

-- 
Jean Delvare