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/*
* This software is copyrighted as noted below. It may be freely copied,
* modified, and redistributed, provided that the copyright notice is
* preserved on all copies.
*
* There is no warranty or other guarantee of fitness for this software,
* it is provided solely "as is". Bug reports or fixes may be sent
* to the author, who may or may not act on them as he desires.
*
* You may not include this software in a program or other software product
* without supplying the source, or without informing the end-user that the
* source is available for no extra charge.
*
* If you modify this software, you should include a notice giving the
* name of the person performing the modification, the date of modification,
* and the reason for such modification.
*/
/*
* rle_getcom.c - Get specific comments from the_hdr structure.
*
* Author: Spencer W. Thomas
* Computer Science Dept.
* University of Utah
* Date: Sun Jan 25 1987
* Copyright (c) 1987, University of Utah
*/
#include <stdio.h>
#include "rle.h"
/*****************************************************************
* TAG( match )
*
* Match a name against a test string for "name=value" or "name".
* If it matches name=value, return pointer to value part, if just
* name, return pointer to NUL at end of string. If no match, return NULL.
*
* Inputs:
* n: Name to match. May also be "name=value" to make it easier
* to replace comments.
* v: Test string.
* Outputs:
* Returns pointer as above.
* Assumptions:
* [None]
* Algorithm:
* [None]
*/
static const char *
match(const char * const nArg,
const char * const vArg) {
const char * n;
const char * v;
for (n = nArg, v = vArg; *n != '\0' && *n != '=' && *n == *v; n++, v++)
;
if (*n == '\0' || *n == '=') {
if (*v == '\0')
return v;
else if (*v == '=')
return ++v;
}
return NULL;
}
/*****************************************************************
* TAG( rle_getcom )
*
* Return a pointer to the value part of a name=value pair in the comments.
* Inputs:
* name: Name part of the comment to search for.
* the_hdr: rle_dflt_hdr structure.
* Outputs:
* Returns pointer to value part of comment or NULL if no match.
* Assumptions:
* [None]
* Algorithm:
* [None]
*/
const char *
rle_getcom(const char * const name,
rle_hdr * const the_hdr) {
const char ** cp;
if (the_hdr->comments == NULL)
return NULL;
for (cp = the_hdr->comments; *cp; ++cp) {
const char * const v = match(name, *cp);
if (v != NULL )
return v;
}
return NULL;
}
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