FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-15 13:22:55 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

tools:iio:iio_utils: implement digit calculation

Browse Source 
Previously, the return value of sscanf() was treated as an indication of
the digits it would have read. Yet, sscanf() only returns the amount of
valid matches.
Therefore, introduce a function to calculate the decimal digits of the
read number and use this one to commence a colon search, as originally
intended.

Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Hartmut Knaack 2015-05-31 14:40:00 +02:00 committed by Jonathan Cameron
parent dc8b5d6e63
commit 096f9b862e
1 changed files with 31 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
tools/iio/iio_utils.c
View File

@ -431,6 +431,18 @@ error_ret:
return ret;
}
int calc_digits(int num)
{
int count = 0;
while (num != 0) {
num /= 10;
count++;
}
return count;
}
/**
* find_type_by_name() - function to match top level types by name
* @name: top level type instance name
@ -441,7 +453,7 @@ error_ret:
int find_type_by_name(const char *name, const char *type)
{
const struct dirent *ent;
int number, numstrlen;
int number, numstrlen, ret;
FILE *nameFile;
DIR *dp;
@ -459,9 +471,19 @@ int find_type_by_name(const char *name, const char *type)
strcmp(ent->d_name, "..") != 0 &&
strlen(ent->d_name) > strlen(type) &&
strncmp(ent->d_name, type, strlen(type)) == 0) {
numstrlen = sscanf(ent->d_name + strlen(type),
"%d",
&number);
errno = 0;
ret = sscanf(ent->d_name + strlen(type), "%d", &number);
if (ret < 0) {
ret = -errno;
printf("failed to read element number\n");
goto error_close_dir;
} else if (ret != 1) {
ret = -EIO;
printf("failed to match element number\n");
goto error_close_dir;
}
numstrlen = calc_digits(number);
/* verify the next character is not a colon */
if (strncmp(ent->d_name + strlen(type) + numstrlen,
":",
@ -495,6 +517,11 @@ int find_type_by_name(const char *name, const char *type)
}
closedir(dp);
return -ENODEV;
error_close_dir:
if (closedir(dp) == -1)
perror("find_type_by_name(): Failed to close directory");
return ret;
}
int _write_sysfs_int(char *filename, char *basedir, int val, int verify)