GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/xargs/strnsubst.c Lines: 0 19 0.0 %
Date: 2017-11-13 Branches: 0 18 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: strnsubst.c,v 1.6 2017/01/03 21:47:37 tedu Exp $	*/
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/*	$FreeBSD: strnsubst.c,v 1.6 2002/06/22 12:58:42 jmallett Exp $	*/
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/*
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 * Copyright (c) 2002 J. Mallett.  All rights reserved.
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 * You may do whatever you want with this file as long as
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 * the above copyright and this notice remain intact, along
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 * with the following statement:
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 * 	For the man who taught me vi, and who got too old, too young.
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 */
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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void	strnsubst(char **, const char *, const char *, size_t);
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/*
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 * Replaces str with a string consisting of str with match replaced with
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 * replstr as many times as can be done before the constructed string is
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 * maxsize bytes large.  It does not free the string pointed to by str, it
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 * is up to the calling program to be sure that the original contents of
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 * str as well as the new contents are handled in an appropriate manner.
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 * If replstr is NULL, then that internally is changed to a nil-string, so
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 * that we can still pretend to do somewhat meaningful substitution.
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 * No value is returned.
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 */
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void
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strnsubst(char **str, const char *match, const char *replstr, size_t maxsize)
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{
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	char *s1, *s2, *this;
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	size_t matchlen, s2len;
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	int n;
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	if ((s1 = *str) == NULL)
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		return;
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	if ((s2 = malloc(maxsize)) == NULL)
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		err(1, NULL);
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	if (replstr == NULL)
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		replstr = "";
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	if (match == NULL || *match == '\0' || strlen(s1) >= maxsize) {
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		strlcpy(s2, s1, maxsize);
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		goto done;
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	}
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	*s2 = '\0';
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	s2len = 0;
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	matchlen = strlen(match);
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	for (;;) {
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		if ((this = strstr(s1, match)) == NULL)
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			break;
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		n = snprintf(s2 + s2len, maxsize - s2len, "%.*s%s",
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		    (int)(this - s1), s1, replstr);
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		if (n == -1 || n + s2len + strlen(this + matchlen) >= maxsize)
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			break;			/* out of room */
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		s2len += n;
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		s1 = this + matchlen;
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	}
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	strlcpy(s2 + s2len, s1, maxsize - s2len);
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done:
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	*str = s2;
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	return;
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}
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#ifdef TEST
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#include <stdio.h>
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int
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main(void)
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{
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	char *x, *y, *z, *za;
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	x = "{}%$";
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	strnsubst(&x, "%$", "{} enpury!", 255);
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	y = x;
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	strnsubst(&y, "}{}", "ybir", 255);
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	z = y;
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	strnsubst(&z, "{", "v ", 255);
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	za = z;
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	strnsubst(&z, NULL, za, 255);
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	if (strcmp(z, "v ybir enpury!") == 0)
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		printf("strnsubst() seems to work!\n");
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	else
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		printf("strnsubst() is broken.\n");
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	printf("%s\n", z);
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	free(x);
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	free(y);
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	free(z);
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	free(za);
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	return 0;
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}
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#endif