/* * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 * 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 const char* of_strptime(const char *buffer, const char *format, struct tm *tm) { enum { SEARCH_CONVERSION_SPECIFIER, IN_CONVERSION_SPECIFIER } state = SEARCH_CONVERSION_SPECIFIER; size_t i, j, buffer_len, format_len; buffer_len = strlen(buffer); format_len = strlen(format); for (i = j = 0; i < format_len; i++) { if (j >= buffer_len) 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, max_len, number = 0; switch (format[i]) { case 'd': case 'e': case 'H': case 'm': case 'M': case 'S': case 'y': max_len = 2; break; case 'Y': max_len = 4; break; case '%': case 'n': case 't': max_len = 0; break; default: return NULL; } if (max_len > 0 && (buffer[j] < '0' || buffer[j] > '9')) return NULL; for (k = 0; k < max_len && j < buffer_len && buffer[j] >= '0' && buffer[j] <= '9'; k++, j++) { number *= 10; number += buffer[j] - '0'; } switch (format[i]) { 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 '%': if (buffer[j++] != '%') return NULL; break; case 'n': case 't': if (buffer[j] != ' ' && buffer[j] != '\r' && buffer[j] != '\n' && buffer[j] != '\t' && buffer[j] != '\f') return NULL; j++; break; } state = SEARCH_CONVERSION_SPECIFIER; break; } } return buffer + j; }