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Add functions to parse uint16_t

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This commit is contained in:
Andrew Bettison 2015-10-01 06:52:30 +09:30
parent f73cd77185
commit 367d54f5f8
2 changed files with 35 additions and 2 deletions
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35
str.c
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@ -753,9 +753,35 @@ char *str_str(char *haystack, const char *needle, size_t haystack_len)
return NULL;
}
int str_is_uint64_decimal(const char *str)
int str_to_uint16(const char *str, unsigned base, uint16_t *result, const char **afterp)
{
return str_to_uint64(str, 10, NULL, NULL);
return strn_to_uint16(str, 0, base, result, afterp);
}
int strn_to_uint16(const char *str, size_t strlen, unsigned base, uint16_t *result, const char **afterp)
{
assert(base > 0);
assert(base <= 16);
uint16_t value = 0;
uint16_t newvalue = 0;
const char *const end = str + strlen;
const char *s;
for (s = str; strlen ? s < end : *s; ++s) {
int digit = hexvalue(*s);
if (digit < 0 || (unsigned)digit >= base)
break;
newvalue = value * base + digit;
if (newvalue / base != value) // overflow
break;
value = newvalue;
}
if (afterp)
*afterp = s;
if (s == str || value != newvalue || (!afterp && (strlen ? s != end : *s)))
return 0;
if (result)
*result = value;
return 1;
}
int str_to_int32(const char *str, unsigned base, int32_t *result, const char **afterp)
@ -805,6 +831,11 @@ int strn_to_uint32(const char *str, size_t strlen, unsigned base, uint32_t *resu
return 1;
}
int str_is_uint64_decimal(const char *str)
{
return str_to_uint64(str, 10, NULL, NULL);
}
int str_to_int64(const char *str, unsigned base, int64_t *result, const char **afterp)
{
if (isspace(*str))

2
str.h
View File

@ -431,6 +431,7 @@ int str_is_uint64_decimal(const char *str);
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int str_to_uint16(const char *str, unsigned base, uint16_t *result, const char **afterp);
int str_to_int32(const char *str, unsigned base, int32_t *result, const char **afterp);
int str_to_uint32(const char *str, unsigned base, uint32_t *result, const char **afterp);
int str_to_int64(const char *str, unsigned base, int64_t *result, const char **afterp);
@ -447,6 +448,7 @@ int str_to_uint64(const char *str, unsigned base, uint64_t *result, const char *
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
int strn_to_uint16(const char *str, size_t strlen, unsigned base, uint16_t *result, const char **afterp);
int strn_to_uint32(const char *str, size_t strlen, unsigned base, uint32_t *result, const char **afterp);
int strn_to_uint64(const char *str, size_t strlen, unsigned base, uint64_t *result, const char **afterp);