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98 lines
2.2 KiB
C
98 lines
2.2 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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* * Sat Feb 09 2002, Jason Thomas <jason@topic.com.au>,
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* Matthew Hawkins <matt@mh.dropbear.id.au>
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* - Kissed strtok() goodbye
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*/
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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 <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/bug.h>
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#include <linux/errno.h>
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#include <string.h>
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/**
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* skip_spaces - Removes leading whitespace from @str.
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* @str: The string to be stripped.
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*
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* Returns a pointer to the first non-whitespace character in @str.
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*/
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char *skip_spaces(const char *str)
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{
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while (isspace(*str))
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++str;
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return (char *)str;
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}
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/**
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* strim - Removes leading and trailing whitespace from @s.
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* @s: The string to be stripped.
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*
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* Note that the first trailing whitespace is replaced with a %NUL-terminator
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* in the given string @s. Returns a pointer to the first non-whitespace
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* character in @s.
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*/
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char *strim(char *s)
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{
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size_t size;
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char *end;
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size = strlen(s);
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if (!size)
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return s;
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end = s + size - 1;
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while (end >= s && isspace(*end))
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end--;
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*(end + 1) = '\0';
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return skip_spaces(s);
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}
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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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void memzero_explicit(void *s, size_t count)
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{
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memset(s, 0, count);
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barrier_data(s);
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}
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