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Edit File: string.h
/* Copyright (C) 1991-2022 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* * ISO C99 Standard: 7.21 String handling <string.h> */ #ifndef _STRING_H #define _STRING_H 1 #define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION #include <bits/libc-header-start.h> __BEGIN_DECLS /* Get size_t and NULL from <stddef.h>. */ #define __need_size_t #define __need_NULL #include <stddef.h> /* Tell the caller that we provide correct C++ prototypes. */ #if defined __cplusplus && (__GNUC_PREREQ (4, 4) \ || __glibc_clang_prereq (3, 5)) # define __CORRECT_ISO_CPP_STRING_H_PROTO #endif /* Copy N bytes of SRC to DEST. */ extern void *memcpy (void *__restrict __dest, const void *__restrict __src, size_t __n) __THROW __nonnull ((1, 2)); /* Copy N bytes of SRC to DEST, guaranteeing correct behavior for overlapping strings. */ extern void *memmove (void *__dest, const void *__src, size_t __n) __THROW __nonnull ((1, 2)); /* Copy no more than N bytes of SRC to DEST, stopping when C is found. Return the position in DEST one byte past where C was copied, or NULL if C was not found in the first N bytes of SRC. */ #if defined __USE_MISC || defined __USE_XOPEN || __GLIBC_USE (ISOC2X) extern void *memccpy (void *__restrict __dest, const void *__restrict __src, int __c, size_t __n) __THROW __nonnull ((1, 2)) __attr_access ((__write_only__, 1, 4)); #endif /* Misc || X/Open. */ /* Set N bytes of S to C. */ extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1)); /* Compare N bytes of S1 and S2. */ extern int memcmp (const void *__s1, const void *__s2, size_t __n) __THROW __attribute_pure__ __nonnull ((1, 2)); /* Compare N bytes of S1 and S2. Return zero if S1 and S2 are equal. Return some non-zero value otherwise. Essentially __memcmpeq has the exact same semantics as memcmp except the return value is less constrained. memcmp is always a correct implementation of __memcmpeq. As well !!memcmp, -memcmp, or bcmp are correct implementations. __memcmpeq is meant to be used by compilers when memcmp return is only used for its boolean value. __memcmpeq is declared only for use by compilers. Programs should continue to use memcmp. */ extern int __memcmpeq (const void *__s1, const void *__s2, size_t __n) __THROW __attribute_pure__ __nonnull ((1, 2)); /* Search N bytes of S for C. */ #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" { extern void *memchr (void *__s, int __c, size_t __n) __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1)); extern const void *memchr (const void *__s, int __c, size_t __n) __THROW __asm ("memchr") __attribute_pure__ __nonnull ((1)); # ifdef __OPTIMIZE__ __extern_always_inline void * memchr (void *__s, int __c, size_t __n) __THROW { return __builtin_memchr (__s, __c, __n); } __extern_always_inline const void * memchr (const void *__s, int __c, size_t __n) __THROW { return __builtin_memchr (__s, __c, __n); } # endif } #else extern void *memchr (const void *__s, int __c, size_t __n) __THROW __attribute_pure__ __nonnull ((1)); #endif #ifdef __USE_GNU /* Search in S for C. This is similar to `memchr' but there is no length limit. */ # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" void *rawmemchr (void *__s, int __c) __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1)); extern "C++" const void *rawmemchr (const void *__s, int __c) __THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1)); # else extern void *rawmemchr (const void *__s, int __c) __THROW __attribute_pure__ __nonnull ((1)); # endif /* Search N bytes of S for the final occurrence of C. */ # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" void *memrchr (void *__s, int __c, size_t __n) __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1)) __attr_access ((__read_only__, 1, 3)); extern "C++" const void *memrchr (const void *__s, int __c, size_t __n) __THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1)) __attr_access ((__read_only__, 1, 3)); # else extern void *memrchr (const void *__s, int __c, size_t __n) __THROW __attribute_pure__ __nonnull ((1)) __attr_access ((__read_only__, 1, 3)); # endif #endif /* Copy SRC to DEST. */ extern char *strcpy (char *__restrict __dest, const char *__restrict __src) __THROW __nonnull ((1, 2)); /* Copy no more than N characters of SRC to DEST. */ extern char *strncpy (char *__restrict __dest, const char *__restrict __src, size_t __n) __THROW __nonnull ((1, 2)); /* Append SRC onto DEST. */ extern char *strcat (char *__restrict __dest, const char *__restrict __src) __THROW __nonnull ((1, 2)); /* Append no more than N characters from SRC onto DEST. */ extern char *strncat (char *__restrict __dest, const char *__restrict __src, size_t __n) __THROW __nonnull ((1, 2)); /* Compare S1 and S2. */ extern int strcmp (const char *__s1, const char *__s2) __THROW __attribute_pure__ __nonnull ((1, 2)); /* Compare N characters of S1 and S2. */ extern int strncmp (const char *__s1, const char *__s2, size_t __n) __THROW __attribute_pure__ __nonnull ((1, 2)); /* Compare the collated forms of S1 and S2. */ extern int strcoll (const char *__s1, const char *__s2) __THROW __attribute_pure__ __nonnull ((1, 2)); /* Put a transformation of SRC into no more than N bytes of DEST. */ extern size_t strxfrm (char *__restrict __dest, const char *__restrict __src, size_t __n) __THROW __nonnull ((2)) __attr_access ((__write_only__, 1, 3)); #ifdef __USE_XOPEN2K8 /* POSIX.1-2008 extended locale interface (see locale.h). */ # include <bits/types/locale_t.h> /* Compare the collated forms of S1 and S2, using sorting rules from L. */ extern int strcoll_l (const char *__s1, const char *__s2, locale_t __l) __THROW __attribute_pure__ __nonnull ((1, 2, 3)); /* Put a transformation of SRC into no more than N bytes of DEST, using sorting rules from L. */ extern size_t strxfrm_l (char *__dest, const char *__src, size_t __n, locale_t __l) __THROW __nonnull ((2, 4)) __attr_access ((__write_only__, 1, 3)); #endif #if (defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 \ || __GLIBC_USE (LIB_EXT2) || __GLIBC_USE (ISOC2X)) /* Duplicate S, returning an identical malloc'd string. */ extern char *strdup (const char *__s) __THROW __attribute_malloc__ __nonnull ((1)); #endif /* Return a malloc'd copy of at most N bytes of STRING. The resultant string is terminated even if no null terminator appears before STRING[N]. */ #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2) || __GLIBC_USE (ISOC2X) extern char *strndup (const char *__string, size_t __n) __THROW __attribute_malloc__ __nonnull ((1)); #endif #if defined __USE_GNU && defined __GNUC__ /* Duplicate S, returning an identical alloca'd string. */ # define strdupa(s) \ (__extension__ \ ({ \ const char *__old = (s); \ size_t __len = strlen (__old) + 1; \ char *__new = (char *) __builtin_alloca (__len); \ (char *) memcpy (__new, __old, __len); \ })) /* Return an alloca'd copy of at most N bytes of string. */ # define strndupa(s, n) \ (__extension__ \ ({ \ const char *__old = (s); \ size_t __len = strnlen (__old, (n)); \ char *__new = (char *) __builtin_alloca (__len + 1); \ __new[__len] = '\0'; \ (char *) memcpy (__new, __old, __len); \ })) #endif /* Find the first occurrence of C in S. */ #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" { extern char *strchr (char *__s, int __c) __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1)); extern const char *strchr (const char *__s, int __c) __THROW __asm ("strchr") __attribute_pure__ __nonnull ((1)); # ifdef __OPTIMIZE__ __extern_always_inline char * strchr (char *__s, int __c) __THROW { return __builtin_strchr (__s, __c); } __extern_always_inline const char * strchr (const char *__s, int __c) __THROW { return __builtin_strchr (__s, __c); } # endif } #else extern char *strchr (const char *__s, int __c) __THROW __attribute_pure__ __nonnull ((1)); #endif /* Find the last occurrence of C in S. */ #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" { extern char *strrchr (char *__s, int __c) __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1)); extern const char *strrchr (const char *__s, int __c) __THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1)); # ifdef __OPTIMIZE__ __extern_always_inline char * strrchr (char *__s, int __c) __THROW { return __builtin_strrchr (__s, __c); } __extern_always_inline const char * strrchr (const char *__s, int __c) __THROW { return __builtin_strrchr (__s, __c); } # endif } #else extern char *strrchr (const char *__s, int __c) __THROW __attribute_pure__ __nonnull ((1)); #endif #ifdef __USE_GNU /* This function is similar to `strchr'. But it returns a pointer to the closing NUL byte in case C is not found in S. */ # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" char *strchrnul (char *__s, int __c) __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1)); extern "C++" const char *strchrnul (const char *__s, int __c) __THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1)); # else extern char *strchrnul (const char *__s, int __c) __THROW __attribute_pure__ __nonnull ((1)); # endif #endif /* Return the length of the initial segment of S which consists entirely of characters not in REJECT. */ extern size_t strcspn (const char *__s, const char *__reject) __THROW __attribute_pure__ __nonnull ((1, 2)); /* Return the length of the initial segment of S which consists entirely of characters in ACCEPT. */ extern size_t strspn (const char *__s, const char *__accept) __THROW __attribute_pure__ __nonnull ((1, 2)); /* Find the first occurrence in S of any character in ACCEPT. */ #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" { extern char *strpbrk (char *__s, const char *__accept) __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2)); extern const char *strpbrk (const char *__s, const char *__accept) __THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2)); # ifdef __OPTIMIZE__ __extern_always_inline char * strpbrk (char *__s, const char *__accept) __THROW { return __builtin_strpbrk (__s, __accept); } __extern_always_inline const char * strpbrk (const char *__s, const char *__accept) __THROW { return __builtin_strpbrk (__s, __accept); } # endif } #else extern char *strpbrk (const char *__s, const char *__accept) __THROW __attribute_pure__ __nonnull ((1, 2)); #endif /* Find the first occurrence of NEEDLE in HAYSTACK. */ #ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" { extern char *strstr (char *__haystack, const char *__needle) __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2)); extern const char *strstr (const char *__haystack, const char *__needle) __THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2)); # ifdef __OPTIMIZE__ __extern_always_inline char * strstr (char *__haystack, const char *__needle) __THROW { return __builtin_strstr (__haystack, __needle); } __extern_always_inline const char * strstr (const char *__haystack, const char *__needle) __THROW { return __builtin_strstr (__haystack, __needle); } # endif } #else extern char *strstr (const char *__haystack, const char *__needle) __THROW __attribute_pure__ __nonnull ((1, 2)); #endif /* Divide S into tokens separated by characters in DELIM. */ extern char *strtok (char *__restrict __s, const char *__restrict __delim) __THROW __nonnull ((2)); /* Divide S into tokens separated by characters in DELIM. Information passed between calls are stored in SAVE_PTR. */ extern char *__strtok_r (char *__restrict __s, const char *__restrict __delim, char **__restrict __save_ptr) __THROW __nonnull ((2, 3)); #ifdef __USE_POSIX extern char *strtok_r (char *__restrict __s, const char *__restrict __delim, char **__restrict __save_ptr) __THROW __nonnull ((2, 3)); #endif #ifdef __USE_GNU /* Similar to `strstr' but this function ignores the case of both strings. */ # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" char *strcasestr (char *__haystack, const char *__needle) __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2)); extern "C++" const char *strcasestr (const char *__haystack, const char *__needle) __THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2)); # else extern char *strcasestr (const char *__haystack, const char *__needle) __THROW __attribute_pure__ __nonnull ((1, 2)); # endif #endif #ifdef __USE_GNU /* Find the first occurrence of NEEDLE in HAYSTACK. NEEDLE is NEEDLELEN bytes long; HAYSTACK is HAYSTACKLEN bytes long. */ extern void *memmem (const void *__haystack, size_t __haystacklen, const void *__needle, size_t __needlelen) __THROW __attribute_pure__ __nonnull ((1, 3)) __attr_access ((__read_only__, 1, 2)) __attr_access ((__read_only__, 3, 4)); /* Copy N bytes of SRC to DEST, return pointer to bytes after the last written byte. */ extern void *__mempcpy (void *__restrict __dest, const void *__restrict __src, size_t __n) __THROW __nonnull ((1, 2)); extern void *mempcpy (void *__restrict __dest, const void *__restrict __src, size_t __n) __THROW __nonnull ((1, 2)); #endif /* Return the length of S. */ extern size_t strlen (const char *__s) __THROW __attribute_pure__ __nonnull ((1)); #ifdef __USE_XOPEN2K8 /* Find the length of STRING, but scan at most MAXLEN characters. If no '\0' terminator is found in that many characters, return MAXLEN. */ extern size_t strnlen (const char *__string, size_t __maxlen) __THROW __attribute_pure__ __nonnull ((1)); #endif /* Return a string describing the meaning of the `errno' code in ERRNUM. */ extern char *strerror (int __errnum) __THROW; #ifdef __USE_XOPEN2K /* Reentrant version of `strerror'. There are 2 flavors of `strerror_r', GNU which returns the string and may or may not use the supplied temporary buffer and POSIX one which fills the string into the buffer. To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L without -D_GNU_SOURCE is needed, otherwise the GNU version is preferred. */ # if defined __USE_XOPEN2K && !defined __USE_GNU /* Fill BUF with a string describing the meaning of the `errno' code in ERRNUM. */ # ifdef __REDIRECT_NTH extern int __REDIRECT_NTH (strerror_r, (int __errnum, char *__buf, size_t __buflen), __xpg_strerror_r) __nonnull ((2)) __attr_access ((__write_only__, 2, 3)); # else extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen) __THROW __nonnull ((2)) __attr_access ((__write_only__, 2, 3)); # define strerror_r __xpg_strerror_r # endif # else /* If a temporary buffer is required, at most BUFLEN bytes of BUF will be used. */ extern char *strerror_r (int __errnum, char *__buf, size_t __buflen) __THROW __nonnull ((2)) __wur __attr_access ((__write_only__, 2, 3)); # endif # ifdef __USE_GNU /* Return a string describing the meaning of tthe error in ERR. */ extern const char *strerrordesc_np (int __err) __THROW; /* Return a string with the error name in ERR. */ extern const char *strerrorname_np (int __err) __THROW; # endif #endif #ifdef __USE_XOPEN2K8 /* Translate error number to string according to the locale L. */ extern char *strerror_l (int __errnum, locale_t __l) __THROW; #endif #ifdef __USE_MISC # include <strings.h> /* Set N bytes of S to 0. The compiler will not delete a call to this function, even if S is dead after the call. */ extern void explicit_bzero (void *__s, size_t __n) __THROW __nonnull ((1)) __fortified_attr_access (__write_only__, 1, 2); /* Return the next DELIM-delimited token from *STRINGP, terminating it with a '\0', and update *STRINGP to point past it. */ extern char *strsep (char **__restrict __stringp, const char *__restrict __delim) __THROW __nonnull ((1, 2)); #endif #ifdef __USE_XOPEN2K8 /* Return a string describing the meaning of the signal number in SIG. */ extern char *strsignal (int __sig) __THROW; # ifdef __USE_GNU /* Return an abbreviation string for the signal number SIG. */ extern const char *sigabbrev_np (int __sig) __THROW; /* Return a string describing the meaning of the signal number in SIG, the result is not translated. */ extern const char *sigdescr_np (int __sig) __THROW; # endif /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */ extern char *__stpcpy (char *__restrict __dest, const char *__restrict __src) __THROW __nonnull ((1, 2)); extern char *stpcpy (char *__restrict __dest, const char *__restrict __src) __THROW __nonnull ((1, 2)); /* Copy no more than N characters of SRC to DEST, returning the address of the last character written into DEST. */ extern char *__stpncpy (char *__restrict __dest, const char *__restrict __src, size_t __n) __THROW __nonnull ((1, 2)); extern char *stpncpy (char *__restrict __dest, const char *__restrict __src, size_t __n) __THROW __nonnull ((1, 2)); #endif #ifdef __USE_GNU /* Compare S1 and S2 as strings holding name & indices/version numbers. */ extern int strverscmp (const char *__s1, const char *__s2) __THROW __attribute_pure__ __nonnull ((1, 2)); /* Sautee STRING briskly. */ extern char *strfry (char *__string) __THROW __nonnull ((1)); /* Frobnicate N bytes of S. */ extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1)) __attr_access ((__read_write__, 1, 2)); # ifndef basename /* Return the file name within directory of FILENAME. We don't declare the function if the `basename' macro is available (defined in <libgen.h>) which makes the XPG version of this function available. */ # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO extern "C++" char *basename (char *__filename) __THROW __asm ("basename") __nonnull ((1)); extern "C++" const char *basename (const char *__filename) __THROW __asm ("basename") __nonnull ((1)); # else extern char *basename (const char *__filename) __THROW __nonnull ((1)); # endif # endif #endif #if __GNUC_PREREQ (3,4) # if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function /* Functions with security checks. */ # include <bits/string_fortified.h> # endif #endif __END_DECLS #endif /* string.h */