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-rw-r--r--nuttx/libc/time/lib_strftime.c398
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diff --git a/nuttx/libc/time/lib_strftime.c b/nuttx/libc/time/lib_strftime.c
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-/****************************************************************************
- * libc/time/lib_strftime.c
- *
- * Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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. Neither the name NuttX 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 COPYRIGHT HOLDERS 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
- * COPYRIGHT OWNER 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.
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Included Files
- ****************************************************************************/
-
-#include <nuttx/config.h>
-#include <sys/types.h>
-
-#include <stdio.h>
-#include <time.h>
-#include <debug.h>
-
-#include <nuttx/time.h>
-
-/****************************************************************************
- * Definitions
- ****************************************************************************/
-
-/****************************************************************************
- * Private Type Declarations
- ****************************************************************************/
-
-/****************************************************************************
- * Private Function Prototypes
- ****************************************************************************/
-
-/****************************************************************************
- * Public Constant Data
- ****************************************************************************/
-
-/****************************************************************************
- * Public Data
- ****************************************************************************/
-
-/****************************************************************************
- * Private Data
- ****************************************************************************/
-
-static const char * const g_abbrevmonthname[12] =
-{
- "Jan", "Feb", "Mar", "Apr", "May", "Jun",
- "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
-};
-
-static const char * const g_monthname[12] =
-{
- "January", "February", "March", "April", "May", "June",
- "July", "August", "September", "October", "November", "December"
-};
-
-/****************************************************************************
- * Private Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Function: strftime
- *
- * Description:
- * The strftime() function formats the broken-down time tm according to
- * the format specification format and places the result in the character
- * array s of size max.
- *
- * Ordinary characters placed in the format string are copied to s without
- * conversion. Conversion specifications are introduced by a '%' charac-
- * ter, and terminated by a conversion specifier character, and are
- * replaced in s as follows:
- *
- * %b The abbreviated month name according to the current locale.
- * %B The full month name according to the current locale.
- * %C The century number (year/100) as a 2-digit integer. (SU)
- * %d The day of the month as a decimal number (range 01 to 31).
- * %e Like %d, the day of the month as a decimal number, but a leading
- * zero is replaced by a space.
- * %h Equivalent to %b. (SU)
- * %H The hour as a decimal number using a 24-hour clock (range 00 to 23).
- * %I The hour as a decimal number using a 12-hour clock (range 01 to 12).
- * %j The day of the year as a decimal number (range 001 to 366).
- * %k The hour (24-hour clock) as a decimal number (range 0 to 23);
- * single digits are preceded by a blank. (See also %H.) (TZ)
- * %l The hour (12-hour clock) as a decimal number (range 1 to 12);
- * single digits are preceded by a blank. (See also %I.) (TZ)
- * %m The month as a decimal number (range 01 to 12).
- * %M The minute as a decimal number (range 00 to 59).
- * %n A newline character. (SU)
- * %p Either "AM" or "PM" according to the given time value, or the
- * corresponding strings for the current locale. Noon is treated
- * as "PM" and midnight as "AM".
- * %P Like %p but in lowercase: "am" or "pm" or a corresponding string
- * for the current locale. (GNU)
- * %s The number of seconds since the Epoch, that is, since 1970-01-01
- * 00:00:00 UTC. (TZ)
- * %S The second as a decimal number (range 00 to 60). (The range is
- * up to 60 to allow for occasional leap seconds.)
- * %t A tab character. (SU)
- * %y The year as a decimal number without a century (range 00 to 99).
- * %Y The year as a decimal number including the century.
- * %% A literal '%' character.
- *
- * Returned Value:
- * The strftime() function returns the number of characters placed in the
- * array s, not including the terminating null byte, provided the string,
- * including the terminating null byte, fits. Otherwise, it returns 0,
- * and the contents of the array is undefined.
- *
- ****************************************************************************/
-
-size_t strftime(char *s, size_t max, const char *format, const struct tm *tm)
-{
- const char *str;
- char *dest = s;
- int chleft = max;
- int value;
- int len;
-
- while (*format && chleft > 0)
- {
- /* Just copy regular characters */
-
- if (*format != '%')
- {
- *dest++ = *format++;
- chleft--;
- continue;
- }
-
- /* Handle the format character */
-
- format++;
- len = 0;
-
- switch (*format++)
- {
- /* %a: A three-letter abbreviation for the day of the week. */
- /* %A: The full name for the day of the week. */
-
- case 'a':
- case 'A':
- {
- len = snprintf(dest, chleft, "Day"); /* Not supported */
- }
- break;
-
- /* %h: Equivalent to %b */
-
- case 'h':
-
- /* %b: The abbreviated month name according to the current locale. */
-
- case 'b':
- {
- if (tm->tm_mon < 12)
- {
- str = g_abbrevmonthname[tm->tm_mon];
- len = snprintf(dest, chleft, "%s", str);
- }
- }
- break;
-
- /* %B: The full month name according to the current locale. */
-
- case 'B':
- {
- if (tm->tm_mon < 12)
- {
- str = g_monthname[tm->tm_mon];
- len = snprintf(dest, chleft, "%s", str);
- }
- }
- break;
-
- /* %y: The year as a decimal number without a century (range 00 to 99). */
-
- case 'y':
-
- /* %C: The century number (year/100) as a 2-digit integer. */
-
- case 'C':
- {
- len = snprintf(dest, chleft, "%02d", tm->tm_year % 100);
- }
- break;
-
- /* %d: The day of the month as a decimal number (range 01 to 31). */
-
- case 'd':
- {
- len = snprintf(dest, chleft, "%02d", tm->tm_mday);
- }
- break;
-
- /* %e: Like %d, the day of the month as a decimal number, but a leading
- * zero is replaced by a space.
- */
-
- case 'e':
- {
- len = snprintf(dest, chleft, "%2d", tm->tm_mday);
- }
- break;
-
- /* %H: The hour as a decimal number using a 24-hour clock (range 00 to 23). */
-
- case 'H':
- {
- len = snprintf(dest, chleft, "%02d", tm->tm_hour);
- }
- break;
-
- /* %I: The hour as a decimal number using a 12-hour clock (range 01 to 12). */
-
- case 'I':
- {
- len = snprintf(dest, chleft, "%02d", tm->tm_hour % 12);
- }
- break;
-
- /* %j: The day of the year as a decimal number (range 001 to 366). */
-
- case 'j':
- {
- if (tm->tm_mon < 12)
- {
- value = clock_daysbeforemonth(tm->tm_mon, clock_isleapyear(tm->tm_year)) + tm->tm_mday;
- len = snprintf(dest, chleft, "%03d", value);
- }
- }
- break;
-
- /* %k: The hour (24-hour clock) as a decimal number (range 0 to 23);
- * single digits are preceded by a blank.
- */
-
- case 'k':
- {
- len = snprintf(dest, chleft, "%2d", tm->tm_hour);
- }
- break;
-
- /* %l: The hour (12-hour clock) as a decimal number (range 1 to 12);
- * single digits are preceded by a blank.
- */
-
- case 'l':
- {
- len = snprintf(dest, chleft, "%2d", tm->tm_hour % 12);
- }
- break;
-
- /* %m: The month as a decimal number (range 01 to 12). */
-
- case 'm':
- {
- len = snprintf(dest, chleft, "%02d", tm->tm_mon + 1);
- }
- break;
-
- /* %M: The minute as a decimal number (range 00 to 59). */
-
- case 'M':
- {
- len = snprintf(dest, chleft, "%02d", tm->tm_min);
- }
- break;
-
- /* %n: A newline character. */
-
- case 'n':
- {
- *dest = '\n';
- len = 1;
- }
- break;
-
- /* %p: Either "AM" or "PM" according to the given time value. */
-
- case 'p':
- {
- if (tm->tm_hour >= 12)
- {
- str = "PM";
- }
- else
- {
- str = "AM";
- }
- len = snprintf(dest, chleft, "%s", str);
- }
- break;
-
- /* %P: Like %p but in lowercase: "am" or "pm" */
-
- case 'P':
- {
- if (tm->tm_hour >= 12)
- {
- str = "pm";
- }
- else
- {
- str = "am";
- }
- len = snprintf(dest, chleft, "%s", str);
- }
- break;
-
- /* %s: The number of seconds since the Epoch, that is, since 1970-01-01
- * 00:00:00 UTC.
- */
-
- case 's':
- {
- len = snprintf(dest, chleft, "%d", mktime(tm));
- }
- break;
-
- /* %S: The second as a decimal number (range 00 to 60). (The range is
- * up to 60 to allow for occasional leap seconds.)
- */
-
- case 'S':
- {
- len = snprintf(dest, chleft, "%02d", tm->tm_sec);
- }
- break;
-
- /* %t: A tab character. */
-
- case 't':
- {
- *dest = '\t';
- len = 1;
- }
- break;
-
- /* %Y: The year as a decimal number including the century. */
-
- case 'Y':
- {
- len = snprintf(dest, chleft, "%04d", tm->tm_year + 1900);
- }
- break;
-
- /* %%: A literal '%' character. */
-
- case '%':
- {
- *dest = '%';
- len = 1;
- }
- break;
- }
-
- /* Update counts and pointers */
-
- dest += len;
- chleft -= len;
- }
-
- return max - chleft;
-}
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