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/* Copyright 1996 Acorn Computers Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* File: string32.c
* Purpose: strings terminated by char < 32
* Author: Timothy Roddis
* History: 24-Jan-94: IDJ: created from original TGR sources
*/
#include "string32.h"
/* Strings passed to the toolbox might be terminated with any control character ... */
#define NULL 0
void string_copy (char *dst_txt, char *src_txt)
{
/*
* copy a ctrl-terminated string to a buffer big enough to
* hold the result (no length checking).
*/
if (!src_txt) src_txt = "";
while ((*(dst_txt++)=*(src_txt++))>=32);
*(--dst_txt) = '\0';
}
char *string_copy_chk (char *dst_txt, char *src_txt, int max_len)
{
int i;
/*
* copy a ctrl-terminated string to a buffer checking it is big enough to
* hold the result. Return NULL and nul-terminate, if dst buffer not
* big enough.
*/
if (dst_txt == NULL || max_len == 0)
return NULL;
if (!src_txt) src_txt = "";
for (i=1;(*dst_txt++=*src_txt++)>=32;i++)
if (i>=max_len) {
*(--dst_txt) = '\0';
return NULL;
}
*(--dst_txt) = '\0';
return dst_txt;
}
int string_length (char *txt)
{
int i=0;
/*
* return length of ctrl-terminated string
*/
if (!txt) return 0;
while (*txt++>=32) i++;
return i;
}
void string_to_buffer (char *dst_txt, char *src_txt, int *max_len)
{
/*
* general purpose routine to fill in a user-supplied buffer (and report
* number of bytes written), or just report size of buffer needed.
* If buffer is supplied (dst_txt != 0), then *max_len gives size of supplied
* buffer; if this is not large enough, don't return an error, but return
* size of bufer required!
*/
int src_len = string_length (src_txt) + 1;
if (dst_txt == NULL)
*max_len = src_len;
else /* user-supplied buffer */
{
if (*max_len >= src_len)
string_copy (dst_txt, src_txt);
else
string_copy_chk (dst_txt, src_txt, *max_len);
*max_len = string_length (dst_txt) + 1;
}
}