/* * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, * 2018 * Jonathan Schleifer * * All rights reserved. * * This file is part of ObjFW. It may be distributed under the terms of the * Q Public License 1.0, which can be found in the file LICENSE.QPL included in * the packaging of this file. * * Alternatively, it may be distributed under the terms of the GNU General * Public License, either version 2 or 3, which can be found in the file * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this * file. */ #include "config.h" #include #include #import "macros.h" const char * of_strptime(const char *buffer, const char *format, struct tm *tm, int16_t *tz) { enum { SEARCH_CONVERSION_SPECIFIER, IN_CONVERSION_SPECIFIER } state = SEARCH_CONVERSION_SPECIFIER; size_t j, bufferLen, formatLen; bufferLen = strlen(buffer); formatLen = strlen(format); j = 0; for (size_t i = 0; i < formatLen; i++) { if (j >= bufferLen) return NULL; switch (state) { case SEARCH_CONVERSION_SPECIFIER: if (format[i] == '%') state = IN_CONVERSION_SPECIFIER; else if (format[i] != buffer[j++]) return NULL; break; case IN_CONVERSION_SPECIFIER:; int k, maxLen, number = 0; switch (format[i]) { case 'd': case 'e': case 'H': case 'm': case 'M': case 'S': case 'y': maxLen = 2; break; case 'Y': maxLen = 4; break; case '%': case 'a': case 'b': case 'n': case 't': case 'z': maxLen = 0; break; default: return NULL; } if (maxLen > 0 && (buffer[j] < '0' || buffer[j] > '9')) return NULL; for (k = 0; k < maxLen && j < bufferLen && buffer[j] >= '0' && buffer[j] <= '9'; k++, j++) { number *= 10; number += buffer[j] - '0'; } switch (format[i]) { case 'a': if (bufferLen < j + 3) return NULL; if (memcmp(buffer + j, "Sun", 3) == 0) tm->tm_wday = 0; else if (memcmp(buffer + j, "Mon", 3) == 0) tm->tm_wday = 1; else if (memcmp(buffer + j, "Tue", 3) == 0) tm->tm_wday = 2; else if (memcmp(buffer + j, "Wed", 3) == 0) tm->tm_wday = 3; else if (memcmp(buffer + j, "Thu", 3) == 0) tm->tm_wday = 4; else if (memcmp(buffer + j, "Fri", 3) == 0) tm->tm_wday = 5; else if (memcmp(buffer + j, "Sat", 3) == 0) tm->tm_wday = 6; else return NULL; j += 3; break; case 'b': if (bufferLen < j + 3) return NULL; if (memcmp(buffer + j, "Jan", 3) == 0) tm->tm_mon = 0; else if (memcmp(buffer + j, "Feb", 3) == 0) tm->tm_mon = 1; else if (memcmp(buffer + j, "Mar", 3) == 0) tm->tm_mon = 2; else if (memcmp(buffer + j, "Apr", 3) == 0) tm->tm_mon = 3; else if (memcmp(buffer + j, "May", 3) == 0) tm->tm_mon = 4; else if (memcmp(buffer + j, "Jun", 3) == 0) tm->tm_mon = 5; else if (memcmp(buffer + j, "Jul", 3) == 0) tm->tm_mon = 6; else if (memcmp(buffer + j, "Aug", 3) == 0) tm->tm_mon = 7; else if (memcmp(buffer + j, "Sep", 3) == 0) tm->tm_mon = 8; else if (memcmp(buffer + j, "Oct", 3) == 0) tm->tm_mon = 9; else if (memcmp(buffer + j, "Nov", 3) == 0) tm->tm_mon = 10; else if (memcmp(buffer + j, "Dec", 3) == 0) tm->tm_mon = 11; else return NULL; j += 3; break; case 'd': case 'e': tm->tm_mday = number; break; case 'H': tm->tm_hour = number; break; case 'm': tm->tm_mon = number - 1; break; case 'M': tm->tm_min = number; break; case 'S': tm->tm_sec = number; break; case 'y': if (number <= 68) number += 100; tm->tm_year = number; break; case 'Y': if (number < 1900) return NULL; tm->tm_year = number - 1900; break; case 'z': if (buffer[j] == '-' || buffer[j] == '+') { const char *b = buffer + j; if (bufferLen < j + 5) return NULL; if (tz == NULL) break; *tz = (((int16_t)b[1] - '0') * 600 + ((int16_t)b[2] - '0') * 60 + ((int16_t)b[3] - '0') * 10 + ((int16_t)b[4] - '0')) * (b[0] == '-' ? -1 : 1); j += 5; } else if (buffer[j] == 'Z') { if (tz != NULL) *tz = 0; j++; } else if (buffer[j] == 'G') { if (bufferLen < j + 3) return NULL; if (buffer[j + 1] != 'M' || buffer[j + 2] != 'T') return NULL; if (tz != NULL) *tz = 0; j += 3; } else return NULL; break; case '%': if (buffer[j++] != '%') return NULL; break; case 'n': if (buffer[j++] != '\n') return NULL; break; case 't': if (buffer[j++] != '\t') return NULL; break; } state = SEARCH_CONVERSION_SPECIFIER; break; } } return buffer + j; }