/* * linux/lib/string.c * * Copyright (C) 1991, 1992 Linus Torvalds */ /* * stupid library routines.. The optimized versions should generally be found * as inline code in <asm-xx/string.h> * * These are buggy as well.. * * * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de> * - Added strsep() which will replace strtok() soon (because strsep() is * reentrant and should be faster). Use only strsep() in new code, please. * * * Sat Feb 09 2002, Jason Thomas <jason@topic.com.au>, * Matthew Hawkins <matt@mh.dropbear.id.au> * - Kissed strtok() goodbye */ #include <linux/types.h> #include <linux/string.h> #include <linux/ctype.h> #include <linux/kernel.h> #include <linux/export.h> #include <linux/bug.h> #include <linux/errno.h> #ifndef __HAVE_ARCH_STRNCPY /** * strncpy - Copy a length-limited, C-string * @dest: Where to copy the string to * @src: Where to copy the string from * @count: The maximum number of bytes to copy * * The result is not %NUL-terminated if the source exceeds * @count bytes. * * In the case where the length of @src is less than that of * count, the remainder of @dest will be padded with %NUL. * */ char *strncpy(char *dest, const char *src, size_t count) { char *tmp = dest; while (count) { if ((*tmp = *src) != 0) src++; tmp++; count--; } return dest; } EXPORT_SYMBOL(strncpy); #endif #ifndef __HAVE_ARCH_STRLCPY /** * strlcpy - Copy a C-string into a sized buffer * @dest: Where to copy the string to * @src: Where to copy the string from * @size: size of destination buffer * * Compatible with *BSD: the result is always a valid * NUL-terminated string that fits in the buffer (unless, * of course, the buffer size is zero). It does not pad * out the result like strncpy() does. */ size_t strlcpy(char *dest, const char *src, size_t size) { size_t ret = strlen(src); if (size) { size_t len = (ret >= size) ? size - 1 : ret; memcpy(dest, src, len); dest[len] = '\0'; } return ret; } #ifndef __HAVE_ARCH_STRLCAT /** * strlcat - Append a length-limited, C-string to another * @dest: The string to be appended to * @src: The string to append to it * @count: The size of the destination buffer. */ size_t strlcat(char *dest, const char *src, size_t count) { size_t dsize = strlen(dest); size_t len = strlen(src); size_t res = dsize + len; /* This would be a bug */ BUG_ON(dsize >= count); dest += dsize; count -= dsize; if (len >= count) len = count-1; memcpy(dest, src, len); dest[len] = 0; return res; } #endif #endif