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libutil: add util_file_read_i()/util_file_read_ui()

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These functions parse a sysfs file and return either an
unsigned integer or signed integer.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Acked-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Sven Schnelle
2020-08-13 13:09:35 +02:00
committed by Jan Höppner
parent 644432ba23
commit 37348ef662
2 changed files with 78 additions and 0 deletions
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2
include/lib/util_file.h
View File

@@ -12,8 +12,10 @@
#define LIB_UTIL_FILE_H
int util_file_read_line(char *str, size_t size, const char *fmt, ...);
int util_file_read_i(int *val, int base, const char *fmt, ...);
int util_file_read_l(long *val, int base, const char *fmt, ...);
int util_file_read_ll(long long *val, int base, const char *fmt, ...);
int util_file_read_ui(unsigned int *val, int base, const char *fmt, ...);
int util_file_read_ul(unsigned long *val, int base, const char *fmt, ...);
int util_file_read_ull(unsigned long long *val, int base, const char *fmt, ...);

76
libutil/util_file.c
View File

@@ -281,6 +281,44 @@ int util_file_write_ull(unsigned long long val, int base, const char *fmt, ...)
return rc;
}
/**
* Read a file and convert it to signed int according to given base
*
* @param[out] val Buffer for value
* @param[in] base Base for conversion, either 8, 10, or 16
* @param[in] fmt Format string for generation of the path name
* @param[in] ... Parameters for format string
*
* @retval 0 Integer has been read correctly
* @retval -1 Error while reading file
*/
int util_file_read_i(int *val, int base, const char *fmt, ...)
{
char path[PATH_MAX], buf[512];
va_list ap;
int count;
/* Construct the file name */
UTIL_VSPRINTF(path, fmt, ap);
if (file_gets(buf, sizeof(buf), path))
return -1;
switch (base) {
case 8:
count = sscanf(buf, "%do", val);
break;
case 10:
count = sscanf(buf, "%dd", val);
break;
case 16:
count = sscanf(buf, "%dx", val);
break;
default:
util_panic("Invalid base: %d\n", base);
}
return (count == 1) ? 0 : -1;
}
/**
* Read a file and convert it to signed long according to given base
*
@@ -357,6 +395,44 @@ int util_file_read_ll(long long *val, int base, const char *fmt, ...)
return (count == 1) ? 0 : -1;
}
/**
* Read a file and convert it to unsigned int according to given base
*
* @param[out] val Buffer for value
* @param[in] base Base for conversion, either 8, 10, or 16
* @param[in] fmt Format string for generation of the path name
* @param[in] ... Parameters for format string
*
* @retval 0 Integer has been read correctly
* @retval -1 Error while reading file
*/
int util_file_read_ui(unsigned int *val, int base, const char *fmt, ...)
{
char path[PATH_MAX], buf[512];
va_list ap;
int count;
/* Construct the file name */
UTIL_VSPRINTF(path, fmt, ap);
if (file_gets(buf, sizeof(buf), path))
return -1;
switch (base) {
case 8:
count = sscanf(buf, "%uo", val);
break;
case 10:
count = sscanf(buf, "%uu", val);
break;
case 16:
count = sscanf(buf, "%ux", val);
break;
default:
util_panic("Invalid base: %d\n", base);
}
return (count == 1) ? 0 : -1;
}
/**
* Read a file and convert it to unsigned long according to given base
*