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7666e8d31b
function specifies size_t. Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Peter Stuge <peter@stuge.se> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@301 f3766cd6-281f-0410-b1cd-43a5c92072e9
113 lines
3 KiB
C
113 lines
3 KiB
C
/*
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* This file is part of the LinuxBIOS project.
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*
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* Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef STRING_H
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#define STRING_H
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#include <arch/types.h>
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/* Prototypes for functions from lib/mem.c. */
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extern void *memcpy(void *dest, const void *src, size_t len);
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extern void *memmove(void *dest, const void *src, size_t len);
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extern void *memset(void *v, unsigned char a, size_t len);
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extern int memcmp(const void *s1, const void *s2, size_t len);
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/* Prototypes for functions from console/vsprintf.c. */
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extern int sprintf(char *buf, const char *fmt, ...);
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/**
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* Calculate the length of a fixed-size string.
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*
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* @param str The input string.
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* @param maxlen Return at most maxlen characters as length of the string.
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* @return The length of the string, not including the final NUL character.
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* The maximum length returned is maxlen.
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*/
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static inline size_t strnlen(const char *str, size_t maxlen)
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{
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size_t len = 0;
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/* NULL and empty strings have length 0. */
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if (!str)
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return 0;
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/* Loop until we find a NUL character, or maxlen is reached. */
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while ((*str++ != '\0') && (len < maxlen))
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len++;
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return len;
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}
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/**
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* Calculate the length of a string.
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*
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* @param str The input string.
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* @return The length of the string, not including the final NUL character.
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*/
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static inline size_t strlen(const char *str)
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{
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size_t len = 0;
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/* NULL and empty strings have length 0. */
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if (!str)
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return 0;
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/* Loop until we find a NUL character. */
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while (*str++ != '\0')
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len++;
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return len;
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}
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/**
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* Compare two strings.
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*
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* @param s1 The first string.
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* @param s2 The second string.
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* @return Returns a value less than zero, if s1 is shorter than s2. Returns
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* zero, if s1 equals s2. Returns a value greater than zero, if
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* s1 is longer than s2.
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*/
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static inline int strcmp(const char *s1, const char *s2)
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{
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char c1, c2;
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/* Set c1 == c2, so that we can enter the while loop. */
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c1 = 0;
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c2 = 0;
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/* Compare characters until they differ, or one of the strings ends. */
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while (c1 == c2) {
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/* Read the next character from each string. */
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c1 = *s1++;
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c2 = *s2++;
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/* Return something negative (if s1 is shorter than s2), or
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zero (if s1 equals s2). */
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if (c1 == '\0')
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return c1 - c2;
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}
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/* Return someting positive (if s1 is longer than s2), or zero (if s1
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and s2 are equal). */
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return c1 - c2;
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}
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#endif /* STRING_H */
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