busybox/libbb/last_char_is.c

/* vi: set sw=4 ts=4: */
/*
 * busybox library eXtended function
 *
 * Copyright (C) 2001 Larry Doolittle, <ldoolitt@recycle.lbl.gov>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */
#include "libbb.h"

/* Find out if the last character of a string matches the one given */
char* FAST_FUNC last_char_is(const char *s, int c)
{
	if (!s[0])
		return NULL;
	while (s[1])
		s++;
	return (*s == (char)c) ? (char *) s : NULL;
}
Standardize on the vi editing directives being on the first line. 2006-07-02 19:47:05 +00:00			`/* vi: set sw=4 ts=4: */`
Another nice cleanup from Larry. This adds a new last_char_is() function and uses it to avoid possible buffer underruns whn strlen is zero, and avoid the possible space-hogging inline of strlen() in several cases. -Erik 2001-04-26 15:56:47 +00:00			`/*`
			`* busybox library eXtended function`
			`*`
			`* Copyright (C) 2001 Larry Doolittle, <ldoolitt@recycle.lbl.gov>`
			`*`
*: make GNU licensing statement forms more regular This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> 2010-08-16 20:14:46 +02:00			`* Licensed under GPLv2 or later, see file LICENSE in this source tree.`
Another nice cleanup from Larry. This adds a new last_char_is() function and uses it to avoid possible buffer underruns whn strlen is zero, and avoid the possible space-hogging inline of strlen() in several cases. -Erik 2001-04-26 15:56:47 +00:00			`*/`
			`#include "libbb.h"`

libbb: code shrink in last_char_is() Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> 2020-06-30 08:33:02 +02:00			`/* Find out if the last character of a string matches the one given */`
*: introduce and use FAST_FUNC: regparm on i386, otherwise no-on text data bss dec hex filename 808035 611 6868 815514 c719a busybox_old 804472 611 6868 811951 c63af busybox_unstripped 2008-06-27 02:52:20 +00:00			`char* FAST_FUNC last_char_is(const char *s, int c)`
Another nice cleanup from Larry. This adds a new last_char_is() function and uses it to avoid possible buffer underruns whn strlen is zero, and avoid the possible space-hogging inline of strlen() in several cases. -Erik 2001-04-26 15:56:47 +00:00			`{`
libbb: shrink last_char_is(), no longer allow NULL string argument function old new delta last_char_is 40 28 -12 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> 2020-07-19 20:49:22 +02:00			`if (!s[0])`
			`return NULL;`
			`while (s[1])`
			`s++;`
			`return (s == (char)c) ? (char ) s : NULL;`
Another nice cleanup from Larry. This adds a new last_char_is() function and uses it to avoid possible buffer underruns whn strlen is zero, and avoid the possible space-hogging inline of strlen() in several cases. -Erik 2001-04-26 15:56:47 +00:00			`}`