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1ea1c7d80f
At present architectures can override strdup() but not strndup(). Use the same option for both. Signed-off-by: Simon Glass <sjg@chromium.org>
729 lines
14 KiB
C
729 lines
14 KiB
C
/*
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* linux/lib/string.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/*
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* stupid library routines.. The optimized versions should generally be found
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* as inline code in <asm-xx/string.h>
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*
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* These are buggy as well..
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*
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* * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de>
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* - Added strsep() which will replace strtok() soon (because strsep() is
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* reentrant and should be faster). Use only strsep() in new code, please.
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*/
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#include <config.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <malloc.h>
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/**
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* strncasecmp - Case insensitive, length-limited string comparison
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* @s1: One string
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* @s2: The other string
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* @len: the maximum number of characters to compare
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*/
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int strncasecmp(const char *s1, const char *s2, size_t len)
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{
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/* Yes, Virginia, it had better be unsigned */
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unsigned char c1, c2;
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c1 = 0; c2 = 0;
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if (len) {
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do {
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c1 = *s1; c2 = *s2;
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s1++; s2++;
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if (!c1)
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break;
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if (!c2)
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break;
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if (c1 == c2)
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continue;
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c1 = tolower(c1);
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c2 = tolower(c2);
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if (c1 != c2)
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break;
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} while (--len);
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}
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return (int)c1 - (int)c2;
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}
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/**
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* strcasecmp - Case insensitive string comparison
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* @s1: One string
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* @s2: The other string
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*/
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int strcasecmp(const char *s1, const char *s2)
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{
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return strncasecmp(s1, s2, -1U);
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}
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char * ___strtok;
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#ifndef __HAVE_ARCH_STRCPY
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/**
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* strcpy - Copy a %NUL terminated string
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* @dest: Where to copy the string to
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* @src: Where to copy the string from
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*/
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char * strcpy(char * dest,const char *src)
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{
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char *tmp = dest;
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while ((*dest++ = *src++) != '\0')
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/* nothing */;
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return tmp;
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}
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#endif
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#ifndef __HAVE_ARCH_STRNCPY
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/**
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* strncpy - Copy a length-limited, %NUL-terminated string
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* @dest: Where to copy the string to
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* @src: Where to copy the string from
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* @count: The maximum number of bytes to copy
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*
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* Note that unlike userspace strncpy, this does not %NUL-pad the buffer.
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* However, the result is not %NUL-terminated if the source exceeds
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* @count bytes.
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*/
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char * strncpy(char * dest,const char *src,size_t count)
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{
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char *tmp = dest;
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while (count-- && (*dest++ = *src++) != '\0')
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/* nothing */;
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return tmp;
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}
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#endif
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#ifndef __HAVE_ARCH_STRLCPY
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/**
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* strlcpy - Copy a C-string into a sized buffer
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* @dest: Where to copy the string to
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* @src: Where to copy the string from
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* @size: size of destination buffer
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*
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* Compatible with *BSD: the result is always a valid
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* NUL-terminated string that fits in the buffer (unless,
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* of course, the buffer size is zero). It does not pad
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* out the result like strncpy() does.
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*/
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size_t strlcpy(char *dest, const char *src, size_t size)
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{
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size_t ret = strlen(src);
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if (size) {
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size_t len = (ret >= size) ? size - 1 : ret;
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memcpy(dest, src, len);
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dest[len] = '\0';
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}
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return ret;
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}
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#endif
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#ifndef __HAVE_ARCH_STRCAT
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/**
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* strcat - Append one %NUL-terminated string to another
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* @dest: The string to be appended to
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* @src: The string to append to it
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*/
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char * strcat(char * dest, const char * src)
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{
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char *tmp = dest;
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while (*dest)
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dest++;
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while ((*dest++ = *src++) != '\0')
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;
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return tmp;
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}
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#endif
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#ifndef __HAVE_ARCH_STRNCAT
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/**
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* strncat - Append a length-limited, %NUL-terminated string to another
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* @dest: The string to be appended to
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* @src: The string to append to it
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* @count: The maximum numbers of bytes to copy
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*
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* Note that in contrast to strncpy, strncat ensures the result is
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* terminated.
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*/
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char * strncat(char *dest, const char *src, size_t count)
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{
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char *tmp = dest;
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if (count) {
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while (*dest)
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dest++;
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while ((*dest++ = *src++)) {
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if (--count == 0) {
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*dest = '\0';
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break;
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}
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}
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}
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return tmp;
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}
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#endif
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#ifndef __HAVE_ARCH_STRCMP
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/**
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* strcmp - Compare two strings
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* @cs: One string
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* @ct: Another string
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*/
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int strcmp(const char * cs,const char * ct)
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{
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register signed char __res;
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while (1) {
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if ((__res = *cs - *ct++) != 0 || !*cs++)
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break;
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}
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return __res;
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}
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#endif
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#ifndef __HAVE_ARCH_STRNCMP
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/**
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* strncmp - Compare two length-limited strings
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* @cs: One string
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* @ct: Another string
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* @count: The maximum number of bytes to compare
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*/
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int strncmp(const char * cs,const char * ct,size_t count)
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{
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register signed char __res = 0;
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while (count) {
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if ((__res = *cs - *ct++) != 0 || !*cs++)
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break;
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count--;
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}
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return __res;
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}
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#endif
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#ifndef __HAVE_ARCH_STRCHR
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/**
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* strchr - Find the first occurrence of a character in a string
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* @s: The string to be searched
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* @c: The character to search for
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*/
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char * strchr(const char * s, int c)
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{
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for(; *s != (char) c; ++s)
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if (*s == '\0')
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return NULL;
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return (char *) s;
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}
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#endif
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const char *strchrnul(const char *s, int c)
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{
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for (; *s != (char)c; ++s)
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if (*s == '\0')
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break;
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return s;
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}
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#ifndef __HAVE_ARCH_STRRCHR
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/**
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* strrchr - Find the last occurrence of a character in a string
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* @s: The string to be searched
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* @c: The character to search for
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*/
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char * strrchr(const char * s, int c)
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{
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const char *p = s + strlen(s);
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do {
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if (*p == (char)c)
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return (char *)p;
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} while (--p >= s);
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return NULL;
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}
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#endif
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#ifndef __HAVE_ARCH_STRLEN
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/**
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* strlen - Find the length of a string
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* @s: The string to be sized
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*/
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size_t strlen(const char * s)
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{
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const char *sc;
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for (sc = s; *sc != '\0'; ++sc)
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/* nothing */;
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return sc - s;
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}
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#endif
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#ifndef __HAVE_ARCH_STRNLEN
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/**
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* strnlen - Find the length of a length-limited string
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* @s: The string to be sized
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* @count: The maximum number of bytes to search
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*/
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size_t strnlen(const char * s, size_t count)
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{
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const char *sc;
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for (sc = s; count-- && *sc != '\0'; ++sc)
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/* nothing */;
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return sc - s;
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}
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#endif
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#ifndef __HAVE_ARCH_STRCSPN
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/**
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* strcspn - Calculate the length of the initial substring of @s which does
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* not contain letters in @reject
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* @s: The string to be searched
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* @reject: The string to avoid
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*/
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size_t strcspn(const char *s, const char *reject)
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{
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const char *p;
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const char *r;
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size_t count = 0;
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for (p = s; *p != '\0'; ++p) {
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for (r = reject; *r != '\0'; ++r) {
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if (*p == *r)
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return count;
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}
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++count;
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}
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return count;
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}
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#endif
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#ifndef __HAVE_ARCH_STRDUP
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char * strdup(const char *s)
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{
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char *new;
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if ((s == NULL) ||
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((new = malloc (strlen(s) + 1)) == NULL) ) {
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return NULL;
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}
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strcpy (new, s);
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return new;
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}
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char * strndup(const char *s, size_t n)
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{
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size_t len;
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char *new;
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if (s == NULL)
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return NULL;
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len = strlen(s);
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if (n < len)
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len = n;
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new = malloc(len + 1);
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if (new == NULL)
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return NULL;
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strncpy(new, s, len);
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new[len] = '\0';
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return new;
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}
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#endif
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#ifndef __HAVE_ARCH_STRSPN
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/**
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* strspn - Calculate the length of the initial substring of @s which only
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* contain letters in @accept
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* @s: The string to be searched
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* @accept: The string to search for
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*/
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size_t strspn(const char *s, const char *accept)
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{
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const char *p;
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const char *a;
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size_t count = 0;
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for (p = s; *p != '\0'; ++p) {
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for (a = accept; *a != '\0'; ++a) {
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if (*p == *a)
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break;
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}
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if (*a == '\0')
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return count;
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++count;
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}
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return count;
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}
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#endif
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#ifndef __HAVE_ARCH_STRPBRK
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/**
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* strpbrk - Find the first occurrence of a set of characters
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* @cs: The string to be searched
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* @ct: The characters to search for
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*/
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char * strpbrk(const char * cs,const char * ct)
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{
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const char *sc1,*sc2;
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for( sc1 = cs; *sc1 != '\0'; ++sc1) {
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for( sc2 = ct; *sc2 != '\0'; ++sc2) {
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if (*sc1 == *sc2)
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return (char *) sc1;
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}
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}
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return NULL;
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}
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#endif
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#ifndef __HAVE_ARCH_STRTOK
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/**
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* strtok - Split a string into tokens
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* @s: The string to be searched
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* @ct: The characters to search for
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*
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* WARNING: strtok is deprecated, use strsep instead.
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*/
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char * strtok(char * s,const char * ct)
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{
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char *sbegin, *send;
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sbegin = s ? s : ___strtok;
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if (!sbegin) {
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return NULL;
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}
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sbegin += strspn(sbegin,ct);
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if (*sbegin == '\0') {
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___strtok = NULL;
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return( NULL );
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}
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send = strpbrk( sbegin, ct);
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if (send && *send != '\0')
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*send++ = '\0';
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___strtok = send;
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return (sbegin);
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}
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#endif
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#ifndef __HAVE_ARCH_STRSEP
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/**
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* strsep - Split a string into tokens
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* @s: The string to be searched
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* @ct: The characters to search for
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*
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* strsep() updates @s to point after the token, ready for the next call.
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*
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* It returns empty tokens, too, behaving exactly like the libc function
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* of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
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* Same semantics, slimmer shape. ;)
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*/
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char * strsep(char **s, const char *ct)
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{
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char *sbegin = *s, *end;
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if (sbegin == NULL)
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return NULL;
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end = strpbrk(sbegin, ct);
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if (end)
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*end++ = '\0';
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*s = end;
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return sbegin;
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}
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#endif
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#ifndef __HAVE_ARCH_STRSWAB
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/**
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* strswab - swap adjacent even and odd bytes in %NUL-terminated string
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* s: address of the string
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*
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* returns the address of the swapped string or NULL on error. If
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* string length is odd, last byte is untouched.
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*/
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char *strswab(const char *s)
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{
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char *p, *q;
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if ((NULL == s) || ('\0' == *s)) {
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return (NULL);
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}
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for (p=(char *)s, q=p+1; (*p != '\0') && (*q != '\0'); p+=2, q+=2) {
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char tmp;
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tmp = *p;
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*p = *q;
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*q = tmp;
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}
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return (char *) s;
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}
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#endif
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#ifndef __HAVE_ARCH_MEMSET
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/**
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* memset - Fill a region of memory with the given value
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* @s: Pointer to the start of the area.
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* @c: The byte to fill the area with
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* @count: The size of the area.
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*
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* Do not use memset() to access IO space, use memset_io() instead.
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*/
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void * memset(void * s,int c,size_t count)
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{
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unsigned long *sl = (unsigned long *) s;
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char *s8;
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#if !CONFIG_IS_ENABLED(TINY_MEMSET)
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unsigned long cl = 0;
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int i;
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/* do it one word at a time (32 bits or 64 bits) while possible */
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if ( ((ulong)s & (sizeof(*sl) - 1)) == 0) {
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for (i = 0; i < sizeof(*sl); i++) {
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cl <<= 8;
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cl |= c & 0xff;
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}
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while (count >= sizeof(*sl)) {
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*sl++ = cl;
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count -= sizeof(*sl);
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}
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}
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#endif /* fill 8 bits at a time */
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s8 = (char *)sl;
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while (count--)
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*s8++ = c;
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return s;
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}
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#endif
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#ifndef __HAVE_ARCH_MEMCPY
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/**
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* memcpy - Copy one area of memory to another
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* @dest: Where to copy to
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* @src: Where to copy from
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* @count: The size of the area.
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*
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* You should not use this function to access IO space, use memcpy_toio()
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* or memcpy_fromio() instead.
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*/
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void * memcpy(void *dest, const void *src, size_t count)
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{
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unsigned long *dl = (unsigned long *)dest, *sl = (unsigned long *)src;
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char *d8, *s8;
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if (src == dest)
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return dest;
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/* while all data is aligned (common case), copy a word at a time */
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if ( (((ulong)dest | (ulong)src) & (sizeof(*dl) - 1)) == 0) {
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while (count >= sizeof(*dl)) {
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*dl++ = *sl++;
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count -= sizeof(*dl);
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}
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}
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/* copy the reset one byte at a time */
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d8 = (char *)dl;
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s8 = (char *)sl;
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while (count--)
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*d8++ = *s8++;
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return dest;
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}
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#endif
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#ifndef __HAVE_ARCH_MEMMOVE
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/**
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* memmove - Copy one area of memory to another
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* @dest: Where to copy to
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* @src: Where to copy from
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* @count: The size of the area.
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*
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* Unlike memcpy(), memmove() copes with overlapping areas.
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*/
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void * memmove(void * dest,const void *src,size_t count)
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{
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char *tmp, *s;
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if (dest <= src) {
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memcpy(dest, src, count);
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} else {
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tmp = (char *) dest + count;
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s = (char *) src + count;
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while (count--)
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*--tmp = *--s;
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}
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return dest;
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}
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#endif
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#ifndef __HAVE_ARCH_MEMCMP
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/**
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* memcmp - Compare two areas of memory
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* @cs: One area of memory
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|
* @ct: Another area of memory
|
|
* @count: The size of the area.
|
|
*/
|
|
int memcmp(const void * cs,const void * ct,size_t count)
|
|
{
|
|
const unsigned char *su1, *su2;
|
|
int res = 0;
|
|
|
|
for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
|
|
if ((res = *su1 - *su2) != 0)
|
|
break;
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_MEMSCAN
|
|
/**
|
|
* memscan - Find a character in an area of memory.
|
|
* @addr: The memory area
|
|
* @c: The byte to search for
|
|
* @size: The size of the area.
|
|
*
|
|
* returns the address of the first occurrence of @c, or 1 byte past
|
|
* the area if @c is not found
|
|
*/
|
|
void * memscan(void * addr, int c, size_t size)
|
|
{
|
|
unsigned char * p = (unsigned char *) addr;
|
|
|
|
while (size) {
|
|
if (*p == c)
|
|
return (void *) p;
|
|
p++;
|
|
size--;
|
|
}
|
|
return (void *) p;
|
|
}
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRSTR
|
|
/**
|
|
* strstr - Find the first substring in a %NUL terminated string
|
|
* @s1: The string to be searched
|
|
* @s2: The string to search for
|
|
*/
|
|
char * strstr(const char * s1,const char * s2)
|
|
{
|
|
int l1, l2;
|
|
|
|
l2 = strlen(s2);
|
|
if (!l2)
|
|
return (char *) s1;
|
|
l1 = strlen(s1);
|
|
while (l1 >= l2) {
|
|
l1--;
|
|
if (!memcmp(s1,s2,l2))
|
|
return (char *) s1;
|
|
s1++;
|
|
}
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_MEMCHR
|
|
/**
|
|
* memchr - Find a character in an area of memory.
|
|
* @s: The memory area
|
|
* @c: The byte to search for
|
|
* @n: The size of the area.
|
|
*
|
|
* returns the address of the first occurrence of @c, or %NULL
|
|
* if @c is not found
|
|
*/
|
|
void *memchr(const void *s, int c, size_t n)
|
|
{
|
|
const unsigned char *p = s;
|
|
while (n-- != 0) {
|
|
if ((unsigned char)c == *p++) {
|
|
return (void *)(p-1);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
#endif
|
|
#ifndef __HAVE_ARCH_MEMCHR_INV
|
|
static void *check_bytes8(const u8 *start, u8 value, unsigned int bytes)
|
|
{
|
|
while (bytes) {
|
|
if (*start != value)
|
|
return (void *)start;
|
|
start++;
|
|
bytes--;
|
|
}
|
|
return NULL;
|
|
}
|
|
/**
|
|
* memchr_inv - Find an unmatching character in an area of memory.
|
|
* @start: The memory area
|
|
* @c: Find a character other than c
|
|
* @bytes: The size of the area.
|
|
*
|
|
* returns the address of the first character other than @c, or %NULL
|
|
* if the whole buffer contains just @c.
|
|
*/
|
|
void *memchr_inv(const void *start, int c, size_t bytes)
|
|
{
|
|
u8 value = c;
|
|
u64 value64;
|
|
unsigned int words, prefix;
|
|
|
|
if (bytes <= 16)
|
|
return check_bytes8(start, value, bytes);
|
|
|
|
value64 = value;
|
|
value64 |= value64 << 8;
|
|
value64 |= value64 << 16;
|
|
value64 |= value64 << 32;
|
|
|
|
prefix = (unsigned long)start % 8;
|
|
if (prefix) {
|
|
u8 *r;
|
|
|
|
prefix = 8 - prefix;
|
|
r = check_bytes8(start, value, prefix);
|
|
if (r)
|
|
return r;
|
|
start += prefix;
|
|
bytes -= prefix;
|
|
}
|
|
|
|
words = bytes / 8;
|
|
|
|
while (words) {
|
|
if (*(u64 *)start != value64)
|
|
return check_bytes8(start, value, 8);
|
|
start += 8;
|
|
words--;
|
|
}
|
|
|
|
return check_bytes8(start, value, bytes % 8);
|
|
}
|
|
#endif
|