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-rw-r--r--newlib/libc/time/strftime.c463
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diff --git a/newlib/libc/time/strftime.c b/newlib/libc/time/strftime.c
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-/*
- * strftime.c
- * Original Author: G. Haley
- *
- * Places characters into the array pointed to by s as controlled by the string
- * pointed to by format. If the total number of resulting characters including
- * the terminating null character is not more than maxsize, returns the number
- * of characters placed into the array pointed to by s (not including the
- * terminating null character); otherwise zero is returned and the contents of
- * the array indeterminate.
- */
-
-/*
-FUNCTION
-<<strftime>>---flexible calendar time formatter
-
-INDEX
- strftime
-
-ANSI_SYNOPSIS
- #include <time.h>
- size_t strftime(char *<[s]>, size_t <[maxsize]>,
- const char *<[format]>, const struct tm *<[timp]>);
-
-TRAD_SYNOPSIS
- #include <time.h>
- size_t strftime(<[s]>, <[maxsize]>, <[format]>, <[timp]>)
- char *<[s]>;
- size_t <[maxsize]>;
- char *<[format]>;
- struct tm *<[timp]>;
-
-DESCRIPTION
-<<strftime>> converts a <<struct tm>> representation of the time (at
-<[timp]>) into a string, starting at <[s]> and occupying no more than
-<[maxsize]> characters.
-
-You control the format of the output using the string at <[format]>.
-<<*<[format]>>> can contain two kinds of specifications: text to be
-copied literally into the formatted string, and time conversion
-specifications. Time conversion specifications are two-character
-sequences beginning with `<<%>>' (use `<<%%>>' to include a percent
-sign in the output). Each defined conversion specification selects a
-field of calendar time data from <<*<[timp]>>>, and converts it to a
-string in one of the following ways:
-
-o+
-o %a
-An abbreviation for the day of the week.
-
-o %A
-The full name for the day of the week.
-
-o %b
-An abbreviation for the month name.
-
-o %B
-The full name of the month.
-
-o %c
-A string representing the complete date and time, in the form
-. Mon Apr 01 13:13:13 1992
-
-o %d
-The day of the month, formatted with two digits.
-
-o %H
-The hour (on a 24-hour clock), formatted with two digits.
-
-o %I
-The hour (on a 12-hour clock), formatted with two digits.
-
-o %j
-The count of days in the year, formatted with three digits
-(from `<<001>>' to `<<366>>').
-
-o %m
-The month number, formatted with two digits.
-
-o %M
-The minute, formatted with two digits.
-
-o %p
-Either `<<AM>>' or `<<PM>>' as appropriate.
-
-o %S
-The second, formatted with two digits.
-
-o %U
-The week number, formatted with two digits (from `<<00>>' to `<<53>>';
-week number 1 is taken as beginning with the first Sunday in a year).
-See also <<%W>>.
-
-o %w
-A single digit representing the day of the week: Sunday is day <<0>>.
-
-o %W
-Another version of the week number: like `<<%U>>', but counting week 1
-as beginning with the first Monday in a year.
-
-o
-o %x
-A string representing the complete date, in a format like
-. Mon Apr 01 1992
-
-o %X
-A string representing the full time of day (hours, minutes, and
-seconds), in a format like
-. 13:13:13
-
-o %y
-The last two digits of the year.
-
-o %Y
-The full year, formatted with four digits to include the century.
-
-o %Z
-The time zone name. If tm_isdst is -1, no output is generated.
-Otherwise, the time zone name based on the TZ environment variable
-is used.
-
-o %%
-A single character, `<<%>>'.
-o-
-
-RETURNS
-When the formatted time takes up no more than <[maxsize]> characters,
-the result is the length of the formatted string. Otherwise, if the
-formatting operation was abandoned due to lack of room, the result is
-<<0>>, and the string starting at <[s]> corresponds to just those
-parts of <<*<[format]>>> that could be completely filled in within the
-<[maxsize]> limit.
-
-PORTABILITY
-ANSI C requires <<strftime>>, but does not specify the contents of
-<<*<[s]>>> when the formatted string would require more than
-<[maxsize]> characters.
-
-<<strftime>> requires no supporting OS subroutines.
-*/
-
-#include <stddef.h>
-#include <stdio.h>
-#include <time.h>
-#include "local.h"
-
-static _CONST int dname_len[7] =
-{6, 6, 7, 9, 8, 6, 8};
-
-static _CONST char *_CONST dname[7] =
-{"Sunday", "Monday", "Tuesday", "Wednesday",
- "Thursday", "Friday", "Saturday"};
-
-static _CONST int mname_len[12] =
-{7, 8, 5, 5, 3, 4, 4, 6, 9, 7, 8, 8};
-
-static _CONST char *_CONST mname[12] =
-{"January", "February", "March", "April",
- "May", "June", "July", "August", "September", "October", "November",
- "December"};
-
-size_t
-_DEFUN (strftime, (s, maxsize, format, tim_p),
- char *s _AND
- size_t maxsize _AND
- _CONST char *format _AND
- _CONST struct tm *tim_p)
-{
- size_t count = 0;
- int i;
-
- for (;;)
- {
- while (*format && *format != '%')
- {
- if (count < maxsize - 1)
- s[count++] = *format++;
- else
- return 0;
- }
-
- if (*format == '\0')
- break;
-
- format++;
- switch (*format)
- {
- case 'a':
- for (i = 0; i < 3; i++)
- {
- if (count < maxsize - 1)
- s[count++] =
- dname[tim_p->tm_wday][i];
- else
- return 0;
- }
- break;
- case 'A':
- for (i = 0; i < dname_len[tim_p->tm_wday]; i++)
- {
- if (count < maxsize - 1)
- s[count++] =
- dname[tim_p->tm_wday][i];
- else
- return 0;
- }
- break;
- case 'b':
- for (i = 0; i < 3; i++)
- {
- if (count < maxsize - 1)
- s[count++] =
- mname[tim_p->tm_mon][i];
- else
- return 0;
- }
- break;
- case 'B':
- for (i = 0; i < mname_len[tim_p->tm_mon]; i++)
- {
- if (count < maxsize - 1)
- s[count++] =
- mname[tim_p->tm_mon][i];
- else
- return 0;
- }
- break;
- case 'c':
- if (count < maxsize - 24)
- {
- for (i = 0; i < 3; i++)
- s[count++] =
- dname[tim_p->tm_wday][i];
- s[count++] = ' ';
- for (i = 0; i < 3; i++)
- s[count++] =
- mname[tim_p->tm_mon][i];
-
- sprintf (&s[count],
- " %.2d %2.2d:%2.2d:%2.2d %.4d",
- tim_p->tm_mday, tim_p->tm_hour,
- tim_p->tm_min,
- tim_p->tm_sec, 1900 +
- tim_p->tm_year);
- count += 17;
- }
- else
- return 0;
- break;
- case 'd':
- if (count < maxsize - 2)
- {
- sprintf (&s[count], "%.2d",
- tim_p->tm_mday);
- count += 2;
- }
- else
- return 0;
- break;
- case 'H':
- if (count < maxsize - 2)
- {
- sprintf (&s[count], "%2.2d",
- tim_p->tm_hour);
- count += 2;
- }
- else
- return 0;
- break;
- case 'I':
- if (count < maxsize - 2)
- {
- if (tim_p->tm_hour == 0 ||
- tim_p->tm_hour == 12)
- {
- s[count++] = '1';
- s[count++] = '2';
- }
- else
- {
- sprintf (&s[count], "%.2d",
- tim_p->tm_hour % 12);
- count += 2;
- }
- }
- else
- return 0;
- break;
- case 'j':
- if (count < maxsize - 3)
- {
- sprintf (&s[count], "%.3d",
- tim_p->tm_yday + 1);
- count += 3;
- }
- else
- return 0;
- break;
- case 'm':
- if (count < maxsize - 2)
- {
- sprintf (&s[count], "%.2d",
- tim_p->tm_mon + 1);
- count += 2;
- }
- else
- return 0;
- break;
- case 'M':
- if (count < maxsize - 2)
- {
- sprintf (&s[count], "%2.2d",
- tim_p->tm_min);
- count += 2;
- }
- else
- return 0;
- break;
- case 'p':
- if (count < maxsize - 2)
- {
- if (tim_p->tm_hour < 12)
- s[count++] = 'A';
- else
- s[count++] = 'P';
-
- s[count++] = 'M';
- }
- else
- return 0;
- break;
- case 'S':
- if (count < maxsize - 2)
- {
- sprintf (&s[count], "%2.2d",
- tim_p->tm_sec);
- count += 2;
- }
- else
- return 0;
- break;
- case 'U':
- if (count < maxsize - 2)
- {
- sprintf (&s[count], "%2.2d",
- (tim_p->tm_yday + 7 -
- tim_p->tm_wday) / 7);
- count += 2;
- }
- else
- return 0;
- break;
- case 'w':
- if (count < maxsize - 1)
- {
- sprintf (&s[count], "%1.1d",
- tim_p->tm_wday);
- count++;
- }
- else
- return 0;
- break;
- case 'W':
- if (count < maxsize - 2)
- {
- int wday = (tim_p->tm_wday) ? tim_p->tm_wday - 1 : 6;
- sprintf (&s[count], "%2.2d",
- (tim_p->tm_yday + 7 -
- wday) / 7);
- count += 2;
- }
- else
- return 0;
- break;
- case 'x':
- if (count < maxsize - 15)
- {
- for (i = 0; i < 3; i++)
- s[count++] =
- dname[tim_p->tm_wday][i];
- s[count++] = ' ';
- for (i = 0; i < 3; i++)
- s[count++] =
- mname[tim_p->tm_mon][i];
-
- sprintf (&s[count],
- " %.2d %.4d", tim_p->tm_mday,
- 1900 + tim_p->tm_year);
- count += 8;
- }
- else
- return 0;
- break;
- case 'X':
- if (count < maxsize - 8)
- {
- sprintf (&s[count],
- "%2.2d:%2.2d:%2.2d",
- tim_p->tm_hour, tim_p->tm_min,
- tim_p->tm_sec);
- count += 8;
- }
- else
- return 0;
- break;
- case 'y':
- if (count < maxsize - 2)
- {
- /* The year could be greater than 100, so we need the value
- modulo 100. The year could be negative, so we need to
- correct for a possible negative remainder. */
- sprintf (&s[count], "%2.2d",
- (tim_p->tm_year % 100 + 100) % 100);
- count += 2;
- }
- else
- return 0;
- break;
- case 'Y':
- if (count < maxsize - 4)
- {
- sprintf (&s[count], "%.4d",
- 1900 + tim_p->tm_year);
- count += 4;
- }
- else
- return 0;
- break;
- case 'Z':
- if (tim_p->tm_isdst >= 0)
- {
- int size;
- TZ_LOCK;
- size = strlen(_tzname[tim_p->tm_isdst]);
- for (i = 0; i < size; i++)
- {
- if (count < maxsize - 1)
- s[count++] = _tzname[tim_p->tm_isdst][i];
- else
- {
- TZ_UNLOCK;
- return 0;
- }
- }
- TZ_UNLOCK;
- }
- break;
- case '%':
- if (count < maxsize - 1)
- s[count++] = '%';
- else
- return 0;
- break;
- }
- if (*format)
- format++;
- else
- break;
- }
- s[count] = '\0';
-
- return count;
-}
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