32 lines
658 B
C
32 lines
658 B
C
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#include <time.h>
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#include <stdlib.h>
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/* timegm -- based on Linux timegm man page */
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time_t
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timegm(struct tm *tm)
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{
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time_t ret;
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char *tz = getenv("TZ");
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const char *tzreq = "UTC+0"; /* more portable than ""? */
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if (tz)
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tz = estrdup(tz, strlen(tz));
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if (setenv("TZ", tzreq, 1) < 0) {
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warning(_("setenv(TZ, %s) failed (%s)"), tzreq, strerror(errno));
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return -1;
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}
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tzset();
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ret = mktime(tm);
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if (tz) {
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if (setenv("TZ", tz, 1) < 0)
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fatal(_("setenv(TZ, %s) restoration failed (%s)"), tz, strerror(errno));
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free(tz);
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} else {
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if (unsetenv("TZ") < 0)
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fatal(_("unsetenv(TZ) failed (%s)"), strerror(errno));
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}
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tzset();
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return ret;
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}
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