Libc-262.tar.gz

[apple/libc.git] / stdtime / asctime.c

diff --git a/stdtime/asctime.c b/stdtime/asctime.c
new file mode 100644 (file)
index 0000000..c669b54
--- /dev/null
+++ b/stdtime/asctime.c
@@ -0,0 +1,78 @@
+/*
+** This file is in the public domain, so clarified as of
+** June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov).
+**
+** $FreeBSD: src/lib/libc/stdtime/asctime.c,v 1.7.6.1 2001/03/05 11:37:20 obrien Exp $
+*/
+
+#ifndef lint
+#ifndef NOID
+static char    elsieid[] = "@(#)asctime.c      7.7";
+#endif /* !defined NOID */
+#endif /* !defined lint */
+
+/*LINTLIBRARY*/
+
+#include "private.h"
+#include "tzfile.h"
+
+/*
+** A la X3J11, with core dump avoidance.
+*/
+
+
+char *
+asctime(timeptr)
+const struct tm *      timeptr;
+{
+       static char *result = NULL;
+
+       if( result == NULL ) {
+               result = (char *)malloc(3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
+                                       3 + 2 + 1 + 1);
+               if( result == NULL )
+                       return NULL;
+       }
+       return(asctime_r(timeptr, result));
+}
+
+char *
+asctime_r(timeptr, result)
+const struct tm *      timeptr;
+char *result;
+{
+       static const char       wday_name[][3] = {
+               "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+       };
+       static const char       mon_name[][3] = {
+               "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+               "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+       };
+       /*
+       ** Big enough for something such as
+       ** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
+       ** (two three-character abbreviations, five strings denoting integers,
+       ** three explicit spaces, two explicit colons, a newline,
+       ** and a trailing ASCII nul).
+       */
+       register const char *   wn;
+       register const char *   mn;
+
+       if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
+               wn = "???";
+       else    wn = wday_name[timeptr->tm_wday];
+       if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
+               mn = "???";
+       else    mn = mon_name[timeptr->tm_mon];
+       /*
+       ** The X3J11-suggested format is
+       **      "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
+       ** Since the .2 in 02.2d is ignored, we drop it.
+       */
+       (void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
+               wn, mn,
+               timeptr->tm_mday, timeptr->tm_hour,
+               timeptr->tm_min, timeptr->tm_sec,
+               TM_YEAR_BASE + timeptr->tm_year);
+       return result;
+}