/* * Copyright (c) 1999 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. */ #ifdef HAVE_CONFIG_H #include #endif #include #ifdef __minix #include #include #include #endif #ifndef __minix #include "roken.h" __RCSID("$Heimdal: strptime.c,v 1.2 1999/11/12 15:29:55 assar Exp $" "$NetBSD: strptime.c,v 1.1.1.3 2002/09/12 12:41:42 joda Exp $"); #endif 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", "Mars", "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; } /* * 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 + 365 + is_leap_year (year) ? 1 : 0) % 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; } } /* * */ char * strptime (const char *buf, const char *format, struct tm *timeptr) { char c; for (; (c = *format) != '\0'; ++format) { char *s; int ret; if (isspace (c)) { while (isspace (*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' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_year = (ret * 100) - tm_year_base; buf = s; 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' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_mday = ret; buf = s; break; case 'H' : case 'k' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_hour = ret; buf = s; break; case 'I' : case 'l' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; if (ret == 12) timeptr->tm_hour = 0; else timeptr->tm_hour = ret; buf = s; break; case 'j' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_yday = ret - 1; buf = s; break; case 'm' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_mon = ret - 1; buf = s; break; case 'M' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_min = ret; buf = s; break; case 'n' : if (*buf == '\n') ++buf; else return NULL; 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' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_sec = ret; buf = s; break; case 't' : if (*buf == '\t') ++buf; else return NULL; 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' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_wday = ret - 1; buf = s; break; case 'w' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_wday = ret; buf = s; break; case 'U' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; set_week_number_sun (timeptr, ret); buf = s; break; case 'V' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; set_week_number_mon4 (timeptr, ret); buf = s; break; case 'W' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; set_week_number_mon (timeptr, ret); buf = s; break; case 'x' : s = strptime (buf, "%Y:%m:%d", timeptr); if (s == NULL) return NULL; buf = s; break; case 'y' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; if (ret < 70) timeptr->tm_year = 100 + ret; else timeptr->tm_year = ret; buf = s; break; case 'Y' : ret = strtol (buf, &s, 10); if (s == buf) return NULL; timeptr->tm_year = ret - tm_year_base; buf = s; 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 (char *)buf; }