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lib/string.c
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/* * 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> |
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#include <linux/kernel.h> #include <linux/export.h> |
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#include <linux/bug.h> |
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#include <linux/errno.h> |
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#ifndef __HAVE_ARCH_STRNICMP /** * strnicmp - Case insensitive, length-limited string comparison * @s1: One string * @s2: The other string * @len: the maximum number of characters to compare */ int strnicmp(const char *s1, const char *s2, size_t len) { /* Yes, Virginia, it had better be unsigned */ unsigned char c1, c2; |
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if (!len) return 0; do { c1 = *s1++; c2 = *s2++; if (!c1 || !c2) break; if (c1 == c2) continue; c1 = tolower(c1); c2 = tolower(c2); if (c1 != c2) break; } while (--len); |
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return (int)c1 - (int)c2; } |
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EXPORT_SYMBOL(strnicmp); #endif |
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#ifndef __HAVE_ARCH_STRCASECMP int strcasecmp(const char *s1, const char *s2) { int c1, c2; do { c1 = tolower(*s1++); c2 = tolower(*s2++); } while (c1 == c2 && c1 != 0); return c1 - c2; } EXPORT_SYMBOL(strcasecmp); #endif #ifndef __HAVE_ARCH_STRNCASECMP int strncasecmp(const char *s1, const char *s2, size_t n) { int c1, c2; do { c1 = tolower(*s1++); c2 = tolower(*s2++); } while ((--n > 0) && c1 == c2 && c1 != 0); return c1 - c2; } EXPORT_SYMBOL(strncasecmp); #endif |
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#ifndef __HAVE_ARCH_STRCPY /** * strcpy - Copy a %NUL terminated string * @dest: Where to copy the string to * @src: Where to copy the string from */ |
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#undef strcpy |
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char *strcpy(char *dest, const char *src) |
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{ char *tmp = dest; while ((*dest++ = *src++) != '\0') /* nothing */; return tmp; } EXPORT_SYMBOL(strcpy); #endif #ifndef __HAVE_ARCH_STRNCPY /** * strncpy - Copy a length-limited, %NUL-terminated 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. |
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* * In the case where the length of @src is less than that of * count, the remainder of @dest will be padded with %NUL. * |
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*/ |
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char *strncpy(char *dest, const char *src, size_t count) |
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{ char *tmp = dest; while (count) { |
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if ((*tmp = *src) != 0) src++; |
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tmp++; count--; } return dest; } EXPORT_SYMBOL(strncpy); #endif #ifndef __HAVE_ARCH_STRLCPY /** * strlcpy - Copy a %NUL terminated 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) { |
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size_t len = (ret >= size) ? size - 1 : ret; |
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memcpy(dest, src, len); dest[len] = '\0'; } return ret; } EXPORT_SYMBOL(strlcpy); #endif #ifndef __HAVE_ARCH_STRCAT /** * strcat - Append one %NUL-terminated string to another * @dest: The string to be appended to * @src: The string to append to it */ |
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#undef strcat |
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char *strcat(char *dest, const char *src) |
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{ char *tmp = dest; while (*dest) dest++; while ((*dest++ = *src++) != '\0') ; |
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return tmp; } EXPORT_SYMBOL(strcat); #endif #ifndef __HAVE_ARCH_STRNCAT /** * strncat - Append a length-limited, %NUL-terminated string to another * @dest: The string to be appended to * @src: The string to append to it * @count: The maximum numbers of bytes to copy * |
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* Note that in contrast to strncpy(), strncat() ensures the result is |
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* terminated. */ |
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char *strncat(char *dest, const char *src, size_t count) |
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{ char *tmp = dest; if (count) { while (*dest) dest++; while ((*dest++ = *src++) != 0) { if (--count == 0) { *dest = '\0'; break; } } } |
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return tmp; } EXPORT_SYMBOL(strncat); #endif #ifndef __HAVE_ARCH_STRLCAT /** * strlcat - Append a length-limited, %NUL-terminated 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; } EXPORT_SYMBOL(strlcat); #endif #ifndef __HAVE_ARCH_STRCMP /** * strcmp - Compare two strings * @cs: One string * @ct: Another string */ |
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#undef strcmp |
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int strcmp(const char *cs, const char *ct) |
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{ |
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unsigned char c1, c2; |
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while (1) { |
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c1 = *cs++; c2 = *ct++; if (c1 != c2) return c1 < c2 ? -1 : 1; if (!c1) |
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break; } |
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return 0; |
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} EXPORT_SYMBOL(strcmp); #endif #ifndef __HAVE_ARCH_STRNCMP /** * strncmp - Compare two length-limited strings * @cs: One string * @ct: Another string * @count: The maximum number of bytes to compare */ |
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int strncmp(const char *cs, const char *ct, size_t count) |
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{ |
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unsigned char c1, c2; |
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while (count) { |
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c1 = *cs++; c2 = *ct++; if (c1 != c2) return c1 < c2 ? -1 : 1; if (!c1) |
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break; count--; } |
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return 0; |
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} EXPORT_SYMBOL(strncmp); #endif #ifndef __HAVE_ARCH_STRCHR /** * strchr - Find the first occurrence of a character in a string * @s: The string to be searched * @c: The character to search for */ |
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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') return NULL; |
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return (char *)s; |
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} EXPORT_SYMBOL(strchr); #endif #ifndef __HAVE_ARCH_STRRCHR /** * strrchr - Find the last occurrence of a character in a string * @s: The string to be searched * @c: The character to search for */ |
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char *strrchr(const char *s, int c) |
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{ const char *p = s + strlen(s); do { if (*p == (char)c) return (char *)p; } while (--p >= s); return NULL; } EXPORT_SYMBOL(strrchr); #endif #ifndef __HAVE_ARCH_STRNCHR /** * strnchr - Find a character in a length limited string * @s: The string to be searched * @count: The number of characters to be searched * @c: The character to search for */ char *strnchr(const char *s, size_t count, int c) { for (; count-- && *s != '\0'; ++s) |
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if (*s == (char)c) return (char *)s; |
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return NULL; } EXPORT_SYMBOL(strnchr); #endif |
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/** |
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* skip_spaces - Removes leading whitespace from @str. * @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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*/ char *skip_spaces(const char *str) { while (isspace(*str)) ++str; return (char *)str; } EXPORT_SYMBOL(skip_spaces); /** |
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* strim - Removes leading and trailing whitespace from @s. |
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* @s: The string to be stripped. * * Note that the first trailing whitespace is replaced with a %NUL-terminator * in the given string @s. Returns a pointer to the first non-whitespace * character in @s. */ |
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char *strim(char *s) |
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{ size_t size; char *end; size = strlen(s); |
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if (!size) return s; end = s + size - 1; |
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while (end >= s && isspace(*end)) |
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end--; *(end + 1) = '\0'; |
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return skip_spaces(s); |
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} |
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EXPORT_SYMBOL(strim); |
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|
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#ifndef __HAVE_ARCH_STRLEN /** * strlen - Find the length of a string * @s: The string to be sized */ |
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size_t strlen(const char *s) |
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{ const char *sc; for (sc = s; *sc != '\0'; ++sc) /* nothing */; return sc - s; } EXPORT_SYMBOL(strlen); #endif #ifndef __HAVE_ARCH_STRNLEN /** * strnlen - Find the length of a length-limited string * @s: The string to be sized * @count: The maximum number of bytes to search */ |
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size_t strnlen(const char *s, size_t count) |
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{ const char *sc; for (sc = s; count-- && *sc != '\0'; ++sc) /* nothing */; return sc - s; } EXPORT_SYMBOL(strnlen); #endif #ifndef __HAVE_ARCH_STRSPN /** |
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* strspn - Calculate the length of the initial substring of @s which only contain letters in @accept |
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* @s: The string to be searched * @accept: The string to search for */ size_t strspn(const char *s, const char *accept) { const char *p; const char *a; size_t count = 0; for (p = s; *p != '\0'; ++p) { for (a = accept; *a != '\0'; ++a) { if (*p == *a) break; } if (*a == '\0') return count; ++count; } |
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return count; } EXPORT_SYMBOL(strspn); #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 not contain letters in @reject |
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* @s: The string to be searched * @reject: The string to avoid */ size_t strcspn(const char *s, const char *reject) { const char *p; const char *r; size_t count = 0; for (p = s; *p != '\0'; ++p) { for (r = reject; *r != '\0'; ++r) { if (*p == *r) return count; } ++count; } |
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return count; |
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} |
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EXPORT_SYMBOL(strcspn); |
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#endif |
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#ifndef __HAVE_ARCH_STRPBRK /** * strpbrk - Find the first occurrence of a set of characters * @cs: The string to be searched * @ct: The characters to search for */ |
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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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|
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for (sc1 = cs; *sc1 != '\0'; ++sc1) { for (sc2 = ct; *sc2 != '\0'; ++sc2) { |
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if (*sc1 == *sc2) |
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return (char *)sc1; |
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} } return NULL; } |
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EXPORT_SYMBOL(strpbrk); |
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#endif #ifndef __HAVE_ARCH_STRSEP /** * strsep - Split a string into tokens * @s: The string to be searched * @ct: The characters to search for * * strsep() updates @s to point after the token, ready for the next call. * * It returns empty tokens, too, behaving exactly like the libc function * of that name. In fact, it was stolen from glibc2 and de-fancy-fied. * Same semantics, slimmer shape. ;) */ |
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char *strsep(char **s, const char *ct) |
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{ |
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char *sbegin = *s; char *end; |
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if (sbegin == NULL) return NULL; end = strpbrk(sbegin, ct); if (end) *end++ = '\0'; *s = end; |
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return sbegin; } |
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EXPORT_SYMBOL(strsep); #endif |
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/** * sysfs_streq - return true if strings are equal, modulo trailing newline * @s1: one string * @s2: another string * * This routine returns true iff two strings are equal, treating both * NUL and newline-then-NUL as equivalent string terminations. It's * geared for use with sysfs input strings, which generally terminate * with newlines but are compared against values without newlines. */ bool sysfs_streq(const char *s1, const char *s2) { while (*s1 && *s1 == *s2) { s1++; s2++; } if (*s1 == *s2) return true; if (!*s1 && *s2 == ' ' && !s2[1]) return true; if (*s1 == ' ' && !s1[1] && !*s2) return true; return false; } EXPORT_SYMBOL(sysfs_streq); |
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/** * strtobool - convert common user inputs into boolean values * @s: input string * @res: result * * This routine returns 0 iff the first character is one of 'Yy1Nn0'. * Otherwise it will return -EINVAL. Value pointed to by res is * updated upon finding a match. */ int strtobool(const char *s, bool *res) { switch (s[0]) { case 'y': case 'Y': case '1': *res = true; break; case 'n': case 'N': case '0': *res = false; break; default: return -EINVAL; } return 0; } EXPORT_SYMBOL(strtobool); |
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#ifndef __HAVE_ARCH_MEMSET /** * memset - Fill a region of memory with the given value * @s: Pointer to the start of the area. * @c: The byte to fill the area with * @count: The size of the area. * * Do not use memset() to access IO space, use memset_io() instead. */ |
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void *memset(void *s, int c, size_t count) |
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{ |
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char *xs = s; |
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while (count--) *xs++ = c; |
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return s; } EXPORT_SYMBOL(memset); #endif #ifndef __HAVE_ARCH_MEMCPY /** * memcpy - Copy one area of memory to another * @dest: Where to copy to * @src: Where to copy from * @count: The size of the area. * * You should not use this function to access IO space, use memcpy_toio() * or memcpy_fromio() instead. */ |
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void *memcpy(void *dest, const void *src, size_t count) |
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{ |
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char *tmp = dest; |
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const char *s = src; |
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while (count--) *tmp++ = *s++; |
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return dest; } EXPORT_SYMBOL(memcpy); #endif #ifndef __HAVE_ARCH_MEMMOVE /** * memmove - Copy one area of memory to another * @dest: Where to copy to * @src: Where to copy from * @count: The size of the area. * * Unlike memcpy(), memmove() copes with overlapping areas. */ |
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void *memmove(void *dest, const void *src, size_t count) |
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{ |
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char *tmp; const char *s; |
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if (dest <= src) { |
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tmp = dest; s = src; |
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while (count--) *tmp++ = *s++; |
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} else { |
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tmp = dest; tmp += count; s = src; s += count; |
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while (count--) *--tmp = *--s; |
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} |
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return dest; } EXPORT_SYMBOL(memmove); #endif #ifndef __HAVE_ARCH_MEMCMP /** * memcmp - Compare two areas of memory * @cs: One area of memory * @ct: Another area of memory * @count: The size of the area. */ |
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#undef memcmp |
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int memcmp(const void *cs, const void *ct, size_t count) |
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{ const unsigned char *su1, *su2; int res = 0; |
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for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--) |
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if ((res = *su1 - *su2) != 0) break; return res; } EXPORT_SYMBOL(memcmp); #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 */ |
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void *memscan(void *addr, int c, size_t size) |
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{ |
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unsigned char *p = addr; |
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while (size) { if (*p == c) |
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return (void *)p; |
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p++; size--; } |
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return (void *)p; |
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} EXPORT_SYMBOL(memscan); #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 */ |
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char *strstr(const char *s1, const char *s2) |
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{ |
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size_t l1, l2; |
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l2 = strlen(s2); if (!l2) |
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return (char *)s1; |
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l1 = strlen(s1); while (l1 >= l2) { l1--; |
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if (!memcmp(s1, s2, l2)) return (char *)s1; |
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s1++; } return NULL; } EXPORT_SYMBOL(strstr); #endif |
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#ifndef __HAVE_ARCH_STRNSTR /** * strnstr - Find the first substring in a length-limited string * @s1: The string to be searched * @s2: The string to search for * @len: the maximum number of characters to search */ char *strnstr(const char *s1, const char *s2, size_t len) { |
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size_t l2; |
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l2 = strlen(s2); if (!l2) return (char *)s1; |
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while (len >= l2) { len--; |
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if (!memcmp(s1, s2, l2)) return (char *)s1; s1++; } return NULL; } EXPORT_SYMBOL(strnstr); #endif |
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#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++) { |
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return (void *)(p - 1); |
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} } return NULL; } EXPORT_SYMBOL(memchr); #endif |
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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); |
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value64 = value; #if defined(ARCH_HAS_FAST_MULTIPLIER) && BITS_PER_LONG == 64 value64 *= 0x0101010101010101; #elif defined(ARCH_HAS_FAST_MULTIPLIER) value64 *= 0x01010101; value64 |= value64 << 32; #else value64 |= value64 << 8; value64 |= value64 << 16; value64 |= value64 << 32; #endif |
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|
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prefix = (unsigned long)start % 8; |
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if (prefix) { |
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u8 *r; prefix = 8 - prefix; r = check_bytes8(start, value, prefix); |
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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); } EXPORT_SYMBOL(memchr_inv); |