在Windows中strptime？

我写了一个在Windows上用来弥补它在Microsoft C运行时库中不存在的代码。 这里是：

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <ctype.h> #ifdef _MSC_VER const char * strp_weekdays[] = { "sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"}; const char * strp_monthnames[] = { "january", "february", "march", "april", "may", "june", "july", "august", "september", "october", "november", "december"}; bool strp_atoi(const char * & s, int & result, int low, int high, int offset) { bool worked = false; char * end; unsigned long num = strtoul(s, & end, 10); if (num >= (unsigned long)low && num <= (unsigned long)high) { result = (int)(num + offset); s = end; worked = true; } return worked; } char * strptime(const char *s, const char *format, struct tm *tm) { bool working = true; while (working && *format && *s) { switch (*format) { case '%': { ++format; switch (*format) { case 'a': case 'A': // weekday name tm->tm_wday = -1; working = false; for (size_t i = 0; i < 7; ++ i) { size_t len = strlen(strp_weekdays[i]); if (!strnicmp(strp_weekdays[i], s, len)) { tm->tm_wday = i; s += len; working = true; break; } else if (!strnicmp(strp_weekdays[i], s, 3)) { tm->tm_wday = i; s += 3; working = true; break; } } break; case 'b': case 'B': case 'h': // month name tm->tm_mon = -1; working = false; for (size_t i = 0; i < 12; ++ i) { size_t len = strlen(strp_monthnames[i]); if (!strnicmp(strp_monthnames[i], s, len)) { tm->tm_mon = i; s += len; working = true; break; } else if (!strnicmp(strp_monthnames[i], s, 3)) { tm->tm_mon = i; s += 3; working = true; break; } } break; case 'd': case 'e': // day of month number working = strp_atoi(s, tm->tm_mday, 1, 31, 0); break; case 'D': // %m/%d/%y { const char * s_save = s; working = strp_atoi(s, tm->tm_mon, 1, 12, -1); if (working && *s == '/') { ++ s; working = strp_atoi(s, tm->tm_mday, 1, 31, 0); if (working && *s == '/') { ++ s; working = strp_atoi(s, tm->tm_year, 0, 99, 0); if (working && tm->tm_year < 69) tm->tm_year += 100; } } if (!working) s = s_save; } break; case 'H': // hour working = strp_atoi(s, tm->tm_hour, 0, 23, 0); break; case 'I': // hour 12-hour clock working = strp_atoi(s, tm->tm_hour, 1, 12, 0); break; case 'j': // day number of year working = strp_atoi(s, tm->tm_yday, 1, 366, -1); break; case 'm': // month number working = strp_atoi(s, tm->tm_mon, 1, 12, -1); break; case 'M': // minute working = strp_atoi(s, tm->tm_min, 0, 59, 0); break; case 'n': // arbitrary whitespace case 't': while (isspace((int)*s)) ++s; break; case 'p': // am / pm if (!strnicmp(s, "am", 2)) { // the hour will be 1 -> 12 maps to 12 am, 1 am .. 11 am, 12 noon 12 pm .. 11 pm if (tm->tm_hour == 12) // 12 am == 00 hours tm->tm_hour = 0; s += 2; } else if (!strnicmp(s, "pm", 2)) { if (tm->tm_hour < 12) // 12 pm == 12 hours tm->tm_hour += 12; // 1 pm -> 13 hours, 11 pm -> 23 hours s += 2; } else working = false; break; case 'r': // 12 hour clock %I:%M:%S %p { const char * s_save = s; working = strp_atoi(s, tm->tm_hour, 1, 12, 0); if (working && *s == ':') { ++ s; working = strp_atoi(s, tm->tm_min, 0, 59, 0); if (working && *s == ':') { ++ s; working = strp_atoi(s, tm->tm_sec, 0, 60, 0); if (working && isspace((int)*s)) { ++ s; while (isspace((int)*s)) ++s; if (!strnicmp(s, "am", 2)) { // the hour will be 1 -> 12 maps to 12 am, 1 am .. 11 am, 12 noon 12 pm .. 11 pm if (tm->tm_hour == 12) // 12 am == 00 hours tm->tm_hour = 0; } else if (!strnicmp(s, "pm", 2)) { if (tm->tm_hour < 12) // 12 pm == 12 hours tm->tm_hour += 12; // 1 pm -> 13 hours, 11 pm -> 23 hours } else working = false; } } } if (!working) s = s_save; } break; case 'R': // %H:%M { const char * s_save = s; working = strp_atoi(s, tm->tm_hour, 0, 23, 0); if (working && *s == ':') { ++ s; working = strp_atoi(s, tm->tm_min, 0, 59, 0); } if (!working) s = s_save; } break; case 'S': // seconds working = strp_atoi(s, tm->tm_sec, 0, 60, 0); break; case 'T': // %H:%M:%S { const char * s_save = s; working = strp_atoi(s, tm->tm_hour, 0, 23, 0); if (working && *s == ':') { ++ s; working = strp_atoi(s, tm->tm_min, 0, 59, 0); if (working && *s == ':') { ++ s; working = strp_atoi(s, tm->tm_sec, 0, 60, 0); } } if (!working) s = s_save; } break; case 'w': // weekday number 0->6 sunday->saturday working = strp_atoi(s, tm->tm_wday, 0, 6, 0); break; case 'Y': // year working = strp_atoi(s, tm->tm_year, 1900, 65535, -1900); break; case 'y': // 2-digit year working = strp_atoi(s, tm->tm_year, 0, 99, 0); if (working && tm->tm_year < 69) tm->tm_year += 100; break; case '%': // escaped if (*s != '%') working = false; ++s; break; default: working = false; } } break; case ' ': case '\t': case '\r': case '\n': case '\f': case '\v': // zero or more whitespaces: while (isspace((int)*s)) ++ s; break; default: // match character if (*s != *format) working = false; else ++s; break; } ++format; } return (working?(char *)s:0); } #endif // _MSC_VER 

写这个函数的时候我提到了在线手册页man strptime（3） 。