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/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
int
libsimple_strtotimespec(struct timespec *restrict ts, const char *restrict s, char **restrict end) /* TODO test */
{
int neg = 0, bracket = 0;
time_t sec = 0;
long int nsec = 0;
long int mul = 100000000L;
const char *p;
if (end)
*end = (void *)s;
while (isspace(*s))
s++;
if (!isdigit(s) && *s != '+' && *s != '-' && *s != '.') {
errno = EINVAL;
return -1;
}
if (*s == '-') {
neg = 1;
s++;
} else if (*s == '+') {
s++;
}
if (*s == '.') {
if (s[1] == '.' || s[1] == '(') {
if (!isdigit(s[2])) {
errno = EINVAL;
return -1;
}
} else if (!isdigit(s[1])) {
errno = EINVAL;
return -1;
}
}
for (; isdigit(*s); s++) {
if (sec < TIME_MIN / 10)
goto overflow;
sec *= 10;
if (sec < TIME_MIN + (*s & 15))
goto overflow;
sec -= *s & 15;
}
if (!neg) {
if (TIME_MIN != -TIME_MAX && sec == TIME_MIN)
goto overflow;
sec = -sec;
}
if (*s != '.') {
ts->tv_sec = sec;
ts->tv_nsec = 0;
if (end)
*end = (void *)s;
return 0;
}
for (s++; mul && isdigit(*s); s++) {
nsec += (*s & 15) * mul;
mul /= 10;
}
if (*s == '.' || *s == '(') {
bracket = *s++ == '(';
p = s;
if (!isdigit(*s)) {
errno = EINVAL;
return -1;
}
for (p = s; isdigit(*p); p++);
if (bracket) {
if (*p == ')') {
p++;
} else {
errno = EINVAL;
return -1;
}
}
if (end)
*end = (void *)p;
p = s;
while (mul) {
for (s = p; mul && isdigit(*s); s++) {
nsec += (*s & 15) * mul;
mul /= 10;
}
}
if (!isdigit(*s))
s = p;
if (*s >= '5') {
nsec += 1;
if (nsec == 1000000000L) {
if (sec == TIME_MAX)
goto overflow;
sec += 1;
nsec = 0;
}
}
} else {
if (isdigit(*s)) {
if (*s >= '5') {
nsec += 1;
if (nsec == 1000000000L) {
if (sec == TIME_MAX)
goto overflow;
sec += 1;
nsec = 0;
}
}
while (isdigit(*s))
s++;
}
if (end)
*end = (void *)s;
}
if (neg && nsec) {
if (sec == TIME_MIN)
goto overflow;
nsec = 1000000000L - nsec;
sec -= 1;
}
return 0;
overflow:
if (neg) {
ts->tv_sec = TIME_MIN;
ts->tv_nsec = 0;
} else {
ts->tv_sec = TIME_MAX;
ts->tv_nsec = 999999999L;
}
errno = ERANGE;
return -1;
}
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