164 lines
3.2 KiB
C
164 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/tools/lib/string.c
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*
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* Copied from linux/lib/string.c, where it is:
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* More specifically, the first copied function was strtobool, which
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* was introduced by:
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*
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* d0f1fed29e6e ("Add a strtobool function matching semantics of existing in kernel equivalents")
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* Author: Jonathan Cameron <jic23@cam.ac.uk>
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/compiler.h>
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/**
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* memdup - duplicate region of memory
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*
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* @src: memory region to duplicate
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* @len: memory region length
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*/
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void *memdup(const void *src, size_t len)
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{
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void *p = malloc(len);
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if (p)
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memcpy(p, src, len);
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return p;
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}
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/**
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* strtobool - convert common user inputs into boolean values
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* @s: input string
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* @res: result
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*
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* This routine returns 0 iff the first character is one of 'Yy1Nn0', or
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* [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value
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* pointed to by res is updated upon finding a match.
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*/
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int strtobool(const char *s, bool *res)
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{
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if (!s)
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return -EINVAL;
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switch (s[0]) {
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case 'y':
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case 'Y':
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case '1':
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*res = true;
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return 0;
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case 'n':
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case 'N':
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case '0':
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*res = false;
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return 0;
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case 'o':
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case 'O':
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switch (s[1]) {
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case 'n':
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case 'N':
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*res = true;
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return 0;
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case 'f':
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case 'F':
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*res = false;
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return 0;
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default:
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break;
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}
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default:
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break;
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}
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return -EINVAL;
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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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* If libc has strlcpy() then that version will override this
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* implementation:
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*/
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size_t __weak 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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/**
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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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* strreplace - Replace all occurrences of character in string.
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* @s: The string to operate on.
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* @old: The character being replaced.
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* @new: The character @old is replaced with.
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*
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* Returns pointer to the nul byte at the end of @s.
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*/
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char *strreplace(char *s, char old, char new)
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{
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for (; *s; ++s)
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if (*s == old)
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*s = new;
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return s;
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}
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