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/* ----------------------------------------------------------------<Prolog>-
Name: sflcvts.c
Title: Convert a time to a string
Package: Standard Function Library (SFL)
Written: 1996/01/05 iMatix SFL project team <sfl@imatix.com>
Revised: 1997/09/08
Copyright: Copyright (c) 1996-2000 iMatix Corporation
License: This is free software; you can redistribute it and/or modify
it under the terms of the SFL License Agreement as provided
in the file LICENSE.TXT. This software is distributed in
the hope that it will be useful, but without any warranty.
------------------------------------------------------------------</Prolog>-*/
#include "prelude.h" /* Universal header file */
#include "sflconv.h" /* Prototypes for functions */
/* ---------------------------------------------------------------------[<]-
Function: conv_time_str
Synopsis: Converts a time to a string. The flags and width control the
resulting string. You can use one or more of these flags added together:
<TABLE>
FLAG_T_HH_AS_H Suppress leading zeroes on the hours.
FLAG_T_MM_AS_M Suppress leading zeroes on the minutes.
FLAG_T_SS_AS_S Suppress leading zeroes on the seconds.
FLAG_T_CC_AS_C Suppress leading zeroes on the centiseconds.
FLAG_T_COMPACT Show without delimiters.
FLAG_T_12_HOUR Append am/pm indicator.
</TABLE>
Returns a pointer to a static area holding the string, or NULL if there
was an error.
If no flags are used, the width argument gives these results (shown
as a picture, which is how conv_time_str works - see conv_time_pict):
<TABLE>
4_or_less Error.
5_to_7 "hh:mm"
8_to_10 "hh:mm:ss"
11_or_more "hh:mm:ss:cc"
</TABLE>
If FLAG_T_COMPACT is used, width gives these results:
<TABLE>
3_or_less Error.
4_to_5 "hhmm"
6_to_7 "hhmmss"
8_or_more "hhmmsscc"
</TABLE>
If FLAG_T_12_HOUR is used, width gives these results:
<TABLE>
5_or_less Error.
6_to_8 "hh:mma"
9_to_11 "hh:mm:ssa"
12_or_more "hh:mm:ss:cca"
</TABLE>
If FLAG_T_COMPACT and FLAG_T_12_HOUR are used, width gives these results:
<TABLE>
4_or_less Error.
5_to_6 "hhmma"
7_to_8 "hhmmssa"
9_or_more "hhmmsscca"
</TABLE>
---------------------------------------------------------------------[>]-*/
char *
conv_time_str (
long time,
int flags,
char timesep,
int width)
{
char
delim [2], /* Delimiter string, ":" or "" */
picture [13]; /* Largest picture: hh:mm:ss:cca */
int
delim_len;
int
space_left = width;
conv_reason = 0; /* No conversion errors so far */
if (flags & FLAG_T_COMPACT)
{
delim [0] = 0;
delim_len = 0;
}
else
{
delim [0] = timesep;
delim [1] = 0;
delim_len = 1;
}
if (flags & FLAG_T_12_HOUR)
space_left--; /* Subtract 1 if eventual "a" */
/* Build-up date picture components until we run out of space */
strcpy (picture, (flags & FLAG_T_HH_AS_H? "h": "hh"));
space_left -= 2;
if (space_left >= delim_len + 2)
{
strcat (picture, delim);
strcat (picture, (flags & FLAG_T_MM_AS_M? "m": "mm"));
space_left -= delim_len + 2;
}
else
return (NULL); /* Error - space_left is too small */
if (space_left >= delim_len + 2)
{
strcat (picture, delim);
strcat (picture, (flags & FLAG_T_SS_AS_S? "s": "ss"));
space_left -= delim_len + 2;
}
if (space_left >= delim_len + 2)
{
strcat (picture, delim);
strcat (picture, (flags & FLAG_T_CC_AS_C? "c": "cc"));
space_left -= delim_len + 2;
}
/* Append "a" (or "aa" if space) if 12-hour clock wanted */
if (flags & FLAG_T_12_HOUR)
strcat (picture, (space_left == 0? "a": "aa"));
return (conv_time_pict (time, picture));
}

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