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2115b87f68
header, and I'm too lazy to do the research for such simple functions. First, drop all functions, as we don't really use all of them. Only reimplement from scratch the following ones: strnlen(), strlen(), strcmp(). No fancy, fast, or small implementations, but I think we don't care (they're only called once or twice anyway). But, at least all functions are well-documented now. Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@247 f3766cd6-281f-0410-b1cd-43a5c92072e9
113 lines
3.1 KiB
C
113 lines
3.1 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 <stdlib.h>
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/* Prototypes for functions from lib/mem.c. */
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extern void *memcpy(void *dest, const void *src, int len);
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extern void *memmove(void *dest, const void *src, int len);
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extern void *memset(void *v, unsigned char a, int len);
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extern int memcmp(const void *s1, const void *s2, int 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 unsigned char *s1, const unsigned char *s2)
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{
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unsigned 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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