/* $NetBSD: strptime.c,v 1.6 1997/07/13 20:26:53 christos Exp $ */ /*- * Copyright (c) 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code was contributed to The NetBSD Foundation by Klaus Klein. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation 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 THE NETBSD FOUNDATION, INC. AND 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 THE FOUNDATION OR 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 #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: strptime.c,v 1.6 1997/07/13 20:26:53 christos Exp $"); #endif #include #include #include #include #include #define _ctloc(x) __CONCAT(_CurrentTimeLocale->,x) /* * We do not implement alternate representations. However, we always * check whether a given modifier is allowed for a certain conversion. */ #define _ALT_E 0x01 #define _ALT_O 0x02 #define _LEGAL_ALT(x) { if (alt_format & ~(x)) return (0); } static int _conv_num __P((const char **, int *, int, int)); char * strptime(buf, fmt, tm) const char *buf, *fmt; struct tm *tm; { char c; const char *bp; int alt_format, i, len; bp = buf; while ((c = *fmt) != '\0') { /* Clear `alternate' modifier prior to new conversion. */ alt_format = 0; /* Eat up white-space. */ if (isspace(c)) { while (isspace(*bp)) bp++; fmt++; continue; } if ((c = *fmt++) != '%') goto literal; again: switch (c = *fmt++) { case '%': /* "%%" is converted to "%". */ literal: if (c != *bp++) return (0); break; /* * "Alternative" modifiers. Just set the appropriate flag * and start over again. */ case 'E': /* "%E?" alternative conversion modifier. */ _LEGAL_ALT(0); alt_format |= _ALT_E; goto again; case 'O': /* "%O?" alternative conversion modifier. */ _LEGAL_ALT(0); alt_format |= _ALT_O; goto again; /* * "Complex" conversion rules, implemented through recursion. */ case 'c': /* Date and time, using the locale's format. */ _LEGAL_ALT(_ALT_E); if (!(bp = strptime(bp, _ctloc(d_t_fmt), tm))) return (0); break; case 'D': /* The date as "%m/%d/%y". */ _LEGAL_ALT(0); if (!(bp = strptime(bp, "%m/%d/%y", tm))) return (0); break; case 'R': /* The time as "%H:%M". */ _LEGAL_ALT(0); if (!(bp = strptime(bp, "%H:%M", tm))) return (0); break; case 'r': /* The time in 12-hour clock representation. */ _LEGAL_ALT(0); if (!(bp = strptime(bp, _ctloc(t_fmt_ampm), tm))) return (0); break; case 'T': /* The time as "%H:%M:%S". */ _LEGAL_ALT(0); if (!(bp = strptime(bp, "%H:%M:%S", tm))) return (0); break; case 'X': /* The time, using the locale's format. */ _LEGAL_ALT(_ALT_E); if (!(bp = strptime(bp, _ctloc(t_fmt), tm))) return (0); break; case 'x': /* The date, using the locale's format. */ _LEGAL_ALT(_ALT_E); if (!(bp = strptime(bp, _ctloc(d_fmt), tm))) return (0); break; /* * "Elementary" conversion rules. */ case 'A': /* The day of week, using the locale's form. */ case 'a': _LEGAL_ALT(0); for (i = 0; i < 7; i++) { /* Full name. */ len = strlen(_ctloc(day[i])); if (strncmp(_ctloc(day[i]), bp, len) == 0) break; /* Abbreviated name. */ len = strlen(_ctloc(abday[i])); if (strncmp(_ctloc(abday[i]), bp, len) == 0) break; } /* Nothing matched. */ if (i == 7) return (0); tm->tm_wday = i; bp += len; break; case 'B': /* The month, using the locale's form. */ case 'b': case 'h': _LEGAL_ALT(0); for (i = 0; i < 12; i++) { /* Full name. */ len = strlen(_ctloc(mon[i])); if (strncmp(_ctloc(mon[i]), bp, len) == 0) break; /* Abbreviated name. */ len = strlen(_ctloc(abmon[i])); if (strncmp(_ctloc(abmon[i]), bp, len) == 0) break; } /* Nothing matched. */ if (i == 12) return (0); tm->tm_mon = i; bp += len; break; case 'C': /* The century number. */ _LEGAL_ALT(_ALT_E); if (!(_conv_num(&bp, &i, 0, 99))) return (0); tm->tm_year = i * 100; break; case 'd': /* The day of month. */ case 'e': _LEGAL_ALT(_ALT_O); if (!(_conv_num(&bp, &tm->tm_mday, 1, 31))) return (0); break; case 'k': /* The hour (24-hour clock representation). */ _LEGAL_ALT(0); /* FALLTHROUGH */ case 'H': _LEGAL_ALT(_ALT_O); if (!(_conv_num(&bp, &tm->tm_hour, 0, 23))) return (0); break; case 'l': /* The hour (12-hour clock representation). */ _LEGAL_ALT(0); /* FALLTHROUGH */ case 'I': _LEGAL_ALT(_ALT_O); if (!(_conv_num(&bp, &tm->tm_hour, 0, 11))) return (0); break; case 'j': /* The day of year. */ _LEGAL_ALT(0); if (!(_conv_num(&bp, &tm->tm_yday, 1, 366))) return (0); break; case 'M': /* The minute. */ _LEGAL_ALT(_ALT_O); if (!(_conv_num(&bp, &tm->tm_min, 0, 59))) return (0); break; case 'm': /* The month. */ _LEGAL_ALT(_ALT_O); if (!(_conv_num(&bp, &tm->tm_mon, 1, 12))) return (0); break; case 'p': /* The locale's equivalent of AM/PM. */ _LEGAL_ALT(0); /* AM? */ if (strcmp(_ctloc(am_pm[0]), bp) == 0) { if (tm->tm_hour > 12) /* i.e., 13:00 AM ?! */ return (0); else if (tm->tm_hour == 12) tm->tm_hour = 0; bp += strlen(_ctloc(am_pm[0])); break; } /* PM? */ else if (strcmp(_ctloc(am_pm[1]), bp) == 0) { if (tm->tm_hour > 12) /* i.e., 13:00 PM ?! */ return (0); else if (tm->tm_hour < 12) tm->tm_hour += 12; bp += strlen(_ctloc(am_pm[1])); break; } /* Nothing matched. */ return (0); case 'S': /* The seconds. */ _LEGAL_ALT(_ALT_O); if (!(_conv_num(&bp, &tm->tm_sec, 1, 61))) return (0); break; case 'U': /* The week of year, beginning on sunday. */ case 'W': /* The week of year, beginning on monday. */ _LEGAL_ALT(_ALT_O); /* * XXX This is bogus, as we can not assume any valid * information present in the tm structure at this * point to calculate a real value, so just check the * range for now. */ if (!(_conv_num(&bp, &i, 0, 53))) return (0); break; case 'w': /* The day of week, beginning on sunday. */ _LEGAL_ALT(_ALT_O); if (!(_conv_num(&bp, &tm->tm_wday, 0, 6))) return (0); break; case 'Y': /* The year. */ _LEGAL_ALT(_ALT_E); if (!(_conv_num(&bp, &i, 0, INT_MAX))) return (0); tm->tm_year = i - 1900; break; case 'y': /* The year within the 20th century. */ _LEGAL_ALT(_ALT_E | _ALT_O); if (!(_conv_num(&bp, &tm->tm_year, 0, 99))) return (0); break; /* * Miscellaneous conversions. */ case 'n': /* Any kind of white-space. */ case 't': _LEGAL_ALT(0); while (isspace(*bp)) bp++; break; default: /* Unknown/unsupported conversion. */ return (0); } } return ((char *)bp); } static int _conv_num(buf, dest, llim, ulim) const char **buf; int *dest; int llim, ulim; { *dest = 0; if (**buf < '0' || **buf > '9') return (0); do { *dest *= 10; *dest += *(*buf)++ - '0'; } while ((*dest * 10 <= ulim) && **buf >= '0' && **buf <= '9'); if (*dest < llim || *dest > ulim) return (0); return (1); }