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225 lines
7.8 KiB
C
225 lines
7.8 KiB
C
/*****************************************************************************/
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/* */
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/* strftime.c */
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/* */
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/* Convert broken down time to a string in a user specified format */
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/* */
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/* */
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/* */
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/* (C) 2002 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <string.h>
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#include <stdio.h>
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#include <time.h>
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/* Use static local variables for speed */
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#pragma staticlocals (on);
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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size_t __fastcall__ strftime (char* buf, size_t bufsize, const char* format,
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const struct tm* tm)
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{
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static const char* days[7] = {
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"Sunday", "Monday", "Tuesday", "Wednesday",
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"Thursday", "Friday", "Saturday"
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};
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static const char* months[12] = {
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"January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December"
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};
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unsigned count;
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unsigned len;
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char c;
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char arg[40];
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const char* argptr;
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/* Copy until we reach the end of the format string or a format specifier */
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count = 0;
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while (1) {
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if (count >= bufsize) {
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/* Not enough buffer space available */
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return 0;
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}
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if ((c = *format++) == '\0') {
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/* End of format string reached */
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*buf = '\0';
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return count;
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}
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if (c == '%') {
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/* Format specifier */
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argptr = arg;
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switch (*format++) {
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case '%':
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arg[0] = '%';
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arg[1] = '\0';
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break;
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case 'A':
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argptr = days[tm->tm_wday];
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break;
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case 'B':
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argptr = months[tm->tm_mon];
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break;
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case 'D':
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sprintf (arg, "%02d/%02d/%02d", tm->tm_mon + 1,
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tm->tm_mday, tm->tm_year % 100);
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break;
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case 'F':
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/* C99 */
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sprintf (arg, "%04d-%02d-%02d", tm->tm_year + 1900,
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tm->tm_mon + 1, tm->tm_mday);
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break;
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case 'H':
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sprintf (arg, "%02d", tm->tm_hour);
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break;
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case 'I':
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sprintf (arg, "%02d", tm->tm_hour % 12);
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break;
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case 'M':
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sprintf (arg, "%02d", tm->tm_min);
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break;
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case 'P':
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/* GNU extension */
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argptr = (tm->tm_hour >= 12)? "pm" : "am";
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break;
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case 'S':
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sprintf (arg, "%02d", tm->tm_sec);
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break;
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case 'U':
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sprintf (arg, "%02d", (tm->tm_yday + 7 - tm->tm_wday) / 7);
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break;
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case 'W':
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sprintf (arg, "%02d",
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(tm->tm_yday + 7 - (tm->tm_wday? tm->tm_wday - 1 : 6)) / 7);
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break;
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case 'X':
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sprintf (arg, "%02d:%02d:%02d", tm->tm_hour,
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tm->tm_min, tm->tm_sec);
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break;
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case 'Y':
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sprintf (arg, "%4d", tm->tm_year + 1900);
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break;
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case 'Z':
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argptr = tm->tm_isdst? _tz.dstname : _tz.tzname;
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break;
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case 'a':
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sprintf (arg, "%.3s", days[tm->tm_wday]);
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break;
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case 'b':
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sprintf (arg, "%.3s", months[tm->tm_mon]);
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break;
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case 'c':
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sprintf (arg, "%.3s %.3s%3d %02d:%02d:%02d %d",
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days[tm->tm_wday], months[tm->tm_mon],
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tm->tm_mday, tm->tm_hour, tm->tm_min,
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tm->tm_sec, tm->tm_year + 1900);
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break;
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case 'd':
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sprintf (arg, "%02d", tm->tm_mday);
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break;
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case 'j':
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sprintf (arg, "%03d", tm->tm_yday + 1);
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break;
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case 'm':
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sprintf (arg, "%02d", tm->tm_mon + 1);
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break;
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case 'p':
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argptr = (tm->tm_hour >= 12)? "PM" : "AM";
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break;
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case 'w':
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sprintf (arg, "%d", tm->tm_wday);
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break;
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case 'x':
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sprintf (arg, "%04d-%02d-%02d", tm->tm_year + 1900,
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tm->tm_mon + 1, tm->tm_mday);
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break;
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case 'y':
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sprintf (arg, "%02d", tm->tm_year % 100);
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break;
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default:
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/* Unknown format specifier, convert to empty string */
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arg[0] = '\0';
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break;
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}
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/* Check if we have enough space to copy the argument string */
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len = strlen (argptr);
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count += len;
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if (count < bufsize) {
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memcpy (buf, argptr, len);
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buf += len;
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}
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} else {
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/* No format character, just copy */
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*buf++ = c;
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++count;
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}
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}
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}
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