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Add str_to_int() and str_to_uint()

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This commit is contained in:
Andrew Bettison 2013-10-16 11:16:04 +10:30
parent 017286b158
commit 609e47faba
2 changed files with 43 additions and 2 deletions
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43
str.c
View File

@ -28,6 +28,7 @@
#include <ctype.h>
#include <assert.h>
#include <limits.h>
#include <errno.h>
const char hexdigit[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
@ -227,13 +228,50 @@ char *str_str(char *haystack, const char *needle, int haystack_len)
return NULL;
}
int str_to_int(const char *str, int base, int *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
errno = 0;
long value = strtol(str, (char**)&end, base);
if (errno == ERANGE || end == str || value > INT_MAX || value < INT_MIN)
return 0;
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
int str_to_uint(const char *str, int base, unsigned *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
errno = 0;
unsigned long value = strtoul(str, (char**)&end, base);
if (errno == ERANGE || end == str || value > UINT_MAX)
return 0;
if (afterp)
*afterp = end;
else if (*end)
return 0;
if (result)
*result = value;
return 1;
}
int str_to_int64(const char *str, int base, int64_t *result, const char **afterp)
{
if (isspace(*str))
return 0;
const char *end = str;
errno = 0;
long long value = strtoll(str, (char**)&end, base);
if (end == str)
if (errno == ERANGE || end == str)
return 0;
if (afterp)
*afterp = end;
@ -249,8 +287,9 @@ int str_to_uint64(const char *str, int base, uint64_t *result, const char **afte
if (isspace(*str))
return 0;
const char *end = str;
errno = 0;
unsigned long long value = strtoull(str, (char**)&end, base);
if (end == str)
if (errno == ERANGE || end == str)
return 0;
if (afterp)
*afterp = end;

2
str.h
View File

@ -206,6 +206,8 @@ char *str_str(char *haystack, const char *needle, int haystack_len);
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int str_to_int(const char *str, int base, int *result, const char **afterp);
int str_to_uint(const char *str, int base, unsigned *result, const char **afterp);
int str_to_int64(const char *str, int base, int64_t *result, const char **afterp);
int str_to_uint64(const char *str, int base, uint64_t *result, const char **afterp);