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/* ============================================================================
*
* File: util.c
* Project: TkDesk
* Started: 12.07.96
* Changed: 12.07.96
*
* Provides several utility C subroutines.
*
* Copyright (C) 1996 Christian Bolik
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* See the file "COPYING" in the base directory of this distribution
* for more.
*
* ========================================================================= */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "libdesk.h"
/* ---------------------------------------------------------------------------
* escape_chars:
* Precedes each char of chars in str with a backslash. Puts the result into
* buf, which must be big enough.
*/
char *escape_chars (str, chars, buf)
char *str;
char *chars;
char *buf;
{
char *bp;
bp = buf;
while (*str) {
if (strchr (chars, *str)) {
*bp++ = '\\';
}
*bp++ = *str++;
}
*bp = '\0';
return buf;
} /* escape_chars */
/* ---------------------------------------------------------------------------
* unescape_chars:
* Removes all backslashes from str, except before }. \t is replaced with
* a real tab. Puts result at buf.
*/
char *unescape_chars (str, buf)
char *str;
char *buf;
{
char *bp;
bp = buf;
while (*str) {
if (*str != '\\') {
*bp++ = *str++;
} else {
switch (*(str + 1)) {
case 't':
str += 2; /* points just past t now */
*bp++ = '\t';
break;
#ifdef UNDEFINED
case '}':
*bp++ = *str++; /* copy backslash in this case */
break;
#endif
default:
str++;
}
}
}
*bp = '\0';
return buf;
} /* unescape_chars */
/* ============================================================================
* Name: itoa
* Desc: Converts an unsigned long integer to a string.
* In : val - integer
* Out : pointer to static string
* ------------------------------------------------------------------------- */
char *itoa(val)
long val;
{
static char str[16];
int i = 0, r;
#define I2CHAR(a) \
if (val >= (a)) { \
r = val / (a); \
str[i++] = '0' + r; \
val -= r * (a); \
} else if (i > 0) \
str[i++] = '0';
I2CHAR(1000000000l);
I2CHAR(100000000l);
I2CHAR(10000000l);
I2CHAR(1000000l);
I2CHAR(100000l);
I2CHAR(10000l);
I2CHAR(1000l);
I2CHAR(100l);
I2CHAR(10l);
str[i++] = '0' + (val % 10);
str[i] = '\0';
return str;
}
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