fc17b349c8
Merge xargs(1) with that of xMach. Bring in xargs(1) changes to add -L and -I as per the Single Unix Specification version 3. Proper exit status numbers are implemented, and the manual page has been updated to reflect reality. The code has been ANSIfied, and a new file has been added to xargs(1) to do the substring substitution as SUSv3 requires. Traditional behaviour should not be affected, use of -J should be deprecated in favor of the more portable -I (though -J has been left, for now). Submitted by: me, tjr (the exit status stuff) Obtained from: xMach
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/* $xMach: strnsubst.c,v 1.3 2002/02/23 02:10:24 jmallett Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2002 J. Mallett. All rights reserved.
|
|
* You may do whatever you want with this file as long as
|
|
* the above copyright and this notice remain intact, along
|
|
* with the following statement:
|
|
* For the man who taught me vi, and who got too old, too young.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <err.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
void strnsubst(char **, const char *, const char *, size_t);
|
|
|
|
/*
|
|
* Replaces str with a string consisting of str with match replaced with
|
|
* replstr as many times as can be done before the constructed string is
|
|
* maxsize bytes large. It does not free the string pointed to by str, it
|
|
* is up to the calling program to be sure that the original contents of
|
|
* str as well as the new contents are handled in an appropriate manner.
|
|
* No value is returned.
|
|
*/
|
|
void
|
|
strnsubst(char **str, const char *match, const char *replstr, size_t maxsize)
|
|
{
|
|
char *s1, *s2;
|
|
|
|
s1 = *str;
|
|
if (s1 == NULL)
|
|
return;
|
|
s2 = calloc(maxsize, 1);
|
|
if (s2 == NULL)
|
|
err(1, "calloc");
|
|
|
|
for (;;) {
|
|
char *this;
|
|
|
|
this = strstr(s1, match);
|
|
if (this == NULL)
|
|
break;
|
|
if ((strlen(s2) + ((uintptr_t)this - (uintptr_t)s1) +
|
|
(strlen(replstr) - 1)) > maxsize) {
|
|
strlcat(s2, s1, maxsize);
|
|
goto done;
|
|
}
|
|
strncat(s2, s1, (uintptr_t)this - (uintptr_t)s1);
|
|
strcat(s2, replstr);
|
|
s1 = this + strlen(match);
|
|
}
|
|
strcat(s2, s1);
|
|
done:
|
|
*str = s2;
|
|
return;
|
|
}
|
|
|
|
#ifdef TEST
|
|
#include <stdio.h>
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
char *x, *y;
|
|
|
|
y = x = "{}{}{}";
|
|
strnsubst(&x, "{}", "v ybir whyv! ", 12);
|
|
if (strcmp(x, "v ybir whyv! ") == 0)
|
|
printf("strnsubst() seems to work as expected.\n");
|
|
printf("x: %s\ny: %s\n", x, y);
|
|
free(x);
|
|
return 0;
|
|
}
|
|
#endif
|