summaryrefslogtreecommitdiffstats
path: root/third_party/heimdal/lib/roken/strptime.c
diff options
context:
space:
mode:
Diffstat (limited to 'third_party/heimdal/lib/roken/strptime.c')
-rw-r--r--third_party/heimdal/lib/roken/strptime.c449
1 files changed, 449 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/roken/strptime.c b/third_party/heimdal/lib/roken/strptime.c
new file mode 100644
index 0000000..86216d2
--- /dev/null
+++ b/third_party/heimdal/lib/roken/strptime.c
@@ -0,0 +1,449 @@
+/*
+ * Copyright (c) 1999, 2003, 2005 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of KTH nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KTH OR ITS CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+
+#include <config.h>
+#include "roken.h"
+#ifdef TEST_STRPFTIME
+#include "strpftime-test.h"
+#endif
+#include <ctype.h>
+
+static const char *abb_weekdays[] = {
+ "Sun",
+ "Mon",
+ "Tue",
+ "Wed",
+ "Thu",
+ "Fri",
+ "Sat",
+ NULL
+};
+
+static const char *full_weekdays[] = {
+ "Sunday",
+ "Monday",
+ "Tuesday",
+ "Wednesday",
+ "Thursday",
+ "Friday",
+ "Saturday",
+ NULL
+};
+
+static const char *abb_month[] = {
+ "Jan",
+ "Feb",
+ "Mar",
+ "Apr",
+ "May",
+ "Jun",
+ "Jul",
+ "Aug",
+ "Sep",
+ "Oct",
+ "Nov",
+ "Dec",
+ NULL
+};
+
+static const char *full_month[] = {
+ "January",
+ "February",
+ "March",
+ "April",
+ "May",
+ "June",
+ "July",
+ "August",
+ "September",
+ "October",
+ "November",
+ "December",
+ NULL,
+};
+
+static const char *ampm[] = {
+ "am",
+ "pm",
+ NULL
+};
+
+/*
+ * Try to match `*buf' to one of the strings in `strs'. Return the
+ * index of the matching string (or -1 if none). Also advance buf.
+ */
+
+static int
+match_string (const char **buf, const char **strs)
+{
+ int i = 0;
+
+ for (i = 0; strs[i] != NULL; ++i) {
+ int len = strlen (strs[i]);
+
+ if (strncasecmp (*buf, strs[i], len) == 0) {
+ *buf += len;
+ return i;
+ }
+ }
+ return -1;
+}
+
+/*
+ * Try to match `*buf' to at the most `n' characters and return the
+ * resulting number in `num'. Returns 0 or an error. Also advance
+ * buf.
+ */
+
+static int
+parse_number (const char **buf, int n, int *num)
+{
+ char *s, *str;
+ int i;
+
+ str = malloc(n + 1);
+ if (str == NULL)
+ return -1;
+
+ /* skip whitespace */
+ for (; **buf != '\0' && isspace((unsigned char)(**buf)); (*buf)++)
+ ;
+
+ /* parse at least n characters */
+ for (i = 0; **buf != '\0' && i < n && isdigit((unsigned char)(**buf)); i++, (*buf)++)
+ str[i] = **buf;
+ str[i] = '\0';
+
+ *num = strtol (str, &s, 10);
+ free(str);
+ if (s == str)
+ return -1;
+
+ return 0;
+}
+
+/*
+ * tm_year is relative this year
+ */
+
+const int tm_year_base = 1900;
+
+/*
+ * Return TRUE iff `year' was a leap year.
+ */
+
+static int
+is_leap_year (int year)
+{
+ return (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0);
+}
+
+/*
+ * Return the weekday [0,6] (0 = Sunday) of the first day of `year'
+ */
+
+static int
+first_day (int year)
+{
+ int ret = 4;
+
+ for (; year > 1970; --year)
+ ret = (ret + (is_leap_year (year) ? 366 : 365)) % 7;
+ return ret;
+}
+
+/*
+ * Set `timeptr' given `wnum' (week number [0, 53])
+ */
+
+static void
+set_week_number_sun (struct tm *timeptr, int wnum)
+{
+ int fday = first_day (timeptr->tm_year + tm_year_base);
+
+ timeptr->tm_yday = wnum * 7 + timeptr->tm_wday - fday;
+ if (timeptr->tm_yday < 0) {
+ timeptr->tm_wday = fday;
+ timeptr->tm_yday = 0;
+ }
+}
+
+/*
+ * Set `timeptr' given `wnum' (week number [0, 53])
+ */
+
+static void
+set_week_number_mon (struct tm *timeptr, int wnum)
+{
+ int fday = (first_day (timeptr->tm_year + tm_year_base) + 6) % 7;
+
+ timeptr->tm_yday = wnum * 7 + (timeptr->tm_wday + 6) % 7 - fday;
+ if (timeptr->tm_yday < 0) {
+ timeptr->tm_wday = (fday + 1) % 7;
+ timeptr->tm_yday = 0;
+ }
+}
+
+/*
+ * Set `timeptr' given `wnum' (week number [0, 53])
+ */
+
+static void
+set_week_number_mon4 (struct tm *timeptr, int wnum)
+{
+ int fday = (first_day (timeptr->tm_year + tm_year_base) + 6) % 7;
+ int offset = 0;
+
+ if (fday < 4)
+ offset += 7;
+
+ timeptr->tm_yday = offset + (wnum - 1) * 7 + timeptr->tm_wday - fday;
+ if (timeptr->tm_yday < 0) {
+ timeptr->tm_wday = fday;
+ timeptr->tm_yday = 0;
+ }
+}
+
+/*
+ *
+ */
+
+ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
+strptime (const char *buf, const char *format, struct tm *timeptr)
+{
+ char c;
+
+ for (; (c = *format) != '\0'; ++format) {
+ char *s;
+ int ret;
+
+ if (isspace ((unsigned char)c)) {
+ while (isspace ((unsigned char)*buf))
+ ++buf;
+ } else if (c == '%' && format[1] != '\0') {
+ c = *++format;
+ if (c == 'E' || c == 'O')
+ c = *++format;
+ switch (c) {
+ case 'A' :
+ ret = match_string (&buf, full_weekdays);
+ if (ret < 0)
+ return NULL;
+ timeptr->tm_wday = ret;
+ break;
+ case 'a' :
+ ret = match_string (&buf, abb_weekdays);
+ if (ret < 0)
+ return NULL;
+ timeptr->tm_wday = ret;
+ break;
+ case 'B' :
+ ret = match_string (&buf, full_month);
+ if (ret < 0)
+ return NULL;
+ timeptr->tm_mon = ret;
+ break;
+ case 'b' :
+ case 'h' :
+ ret = match_string (&buf, abb_month);
+ if (ret < 0)
+ return NULL;
+ timeptr->tm_mon = ret;
+ break;
+ case 'C' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ timeptr->tm_year = (ret * 100) - tm_year_base;
+ break;
+ case 'c' :
+ abort ();
+ case 'D' : /* %m/%d/%y */
+ s = strptime (buf, "%m/%d/%y", timeptr);
+ if (s == NULL)
+ return NULL;
+ buf = s;
+ break;
+ case 'd' :
+ case 'e' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ timeptr->tm_mday = ret;
+ break;
+ case 'H' :
+ case 'k' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ timeptr->tm_hour = ret;
+ break;
+ case 'I' :
+ case 'l' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ if (ret == 12)
+ timeptr->tm_hour = 0;
+ else
+ timeptr->tm_hour = ret;
+ break;
+ case 'j' :
+ if (parse_number(&buf, 3, &ret))
+ return NULL;
+ if (ret == 0)
+ return NULL;
+ timeptr->tm_yday = ret - 1;
+ break;
+ case 'm' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ if (ret == 0)
+ return NULL;
+ timeptr->tm_mon = ret - 1;
+ break;
+ case 'M' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ timeptr->tm_min = ret;
+ break;
+ case 'n' :
+ while (isspace ((unsigned char)*buf))
+ buf++;
+ break;
+ case 'p' :
+ ret = match_string (&buf, ampm);
+ if (ret < 0)
+ return NULL;
+ if (timeptr->tm_hour == 0) {
+ if (ret == 1)
+ timeptr->tm_hour = 12;
+ } else
+ timeptr->tm_hour += 12;
+ break;
+ case 'r' : /* %I:%M:%S %p */
+ s = strptime (buf, "%I:%M:%S %p", timeptr);
+ if (s == NULL)
+ return NULL;
+ buf = s;
+ break;
+ case 'R' : /* %H:%M */
+ s = strptime (buf, "%H:%M", timeptr);
+ if (s == NULL)
+ return NULL;
+ buf = s;
+ break;
+ case 'S' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ timeptr->tm_sec = ret;
+ break;
+ case 't' :
+ while (isspace ((unsigned char)*buf))
+ buf++;
+ break;
+ case 'T' : /* %H:%M:%S */
+ case 'X' :
+ s = strptime (buf, "%H:%M:%S", timeptr);
+ if (s == NULL)
+ return NULL;
+ buf = s;
+ break;
+ case 'u' :
+ if (parse_number(&buf, 1, &ret))
+ return NULL;
+ if (ret <= 0)
+ return NULL;
+ timeptr->tm_wday = ret - 1;
+ break;
+ case 'w' :
+ if (parse_number(&buf, 1, &ret))
+ return NULL;
+ timeptr->tm_wday = ret;
+ break;
+ case 'U' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ set_week_number_sun (timeptr, ret);
+ break;
+ case 'V' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ set_week_number_mon4 (timeptr, ret);
+ break;
+ case 'W' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ set_week_number_mon (timeptr, ret);
+ break;
+ case 'x' :
+ s = strptime (buf, "%Y:%m:%d", timeptr);
+ if (s == NULL)
+ return NULL;
+ buf = s;
+ break;
+ case 'y' :
+ if (parse_number(&buf, 2, &ret))
+ return NULL;
+ if (ret < 70)
+ timeptr->tm_year = 100 + ret;
+ else
+ timeptr->tm_year = ret;
+ break;
+ case 'Y' :
+ if (parse_number(&buf, 4, &ret))
+ return NULL;
+ timeptr->tm_year = ret - tm_year_base;
+ break;
+ case 'Z' :
+ abort ();
+ case '\0' :
+ --format;
+ fallthrough;
+ case '%' :
+ if (*buf == '%')
+ ++buf;
+ else
+ return NULL;
+ break;
+ default :
+ if (*buf == '%' || *++buf == c)
+ ++buf;
+ else
+ return NULL;
+ break;
+ }
+ } else {
+ if (*buf == c)
+ ++buf;
+ else
+ return NULL;
+ }
+ }
+ return rk_UNCONST(buf);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 15:37:21 +0000