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/* See LICENSE file for copyright and license details. */
#include "lib-common.h"
enum libcharconv_result
libcharconv_clock_faces(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
{
int num, thirty;
*n = 0;
for (; slen--; s++) {
if ('0' <= s[0] && s[0] <= '9') {
if (*n)
goto no_conv;
num = (int)(s[0] - '0');
if (!slen--)
goto indeterminate;
*n = 2u;
if (s[1] == ':')
goto conv;
if ('0' > s[1] || s[1] > '9')
goto no_conv;
num *= 10;
num += (int)(s[1] - '0');
if (!slen--)
goto indeterminate;
if (num > 24)
goto no_conv;
*n = 3u;
if (s[2] == ':')
goto conv;
goto no_conv;
} else {
*n += 1u;
}
}
no_conv:
return LIBCHARCONV_NO_CONVERT;
indeterminate:
return LIBCHARCONV_INDETERMINATE;
conv:
if (!slen--)
goto indeterminate;
if (s[*n] == '3')
thirty = 1;
else if (s[*n] == '0')
thirty = 0;
else
goto no_conv;
if (!slen--)
goto indeterminate;
if (s[*n + 1u] != '0')
goto no_conv;
*n += 2u;
if (num > (thirty ? 23 : 34))
goto no_conv;
num %= 12;
num = (!num ? 12 : num) - 1;
num += 12 * thirty;
if (*ncp)
*cp = UINT32_C(0x1F550) + (uint_least32_t)num;
*ncp = 1u;
return LIBCHARCONV_CONVERTED;
}
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