string/string.h

   1 /* Copyright (C) 1991, 92, 93, 95, 96, 97 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 /*
  20  *      ISO C Standard: 4.11 STRING HANDLING    <string.h>
  21  */
  22
  23 #ifndef _STRING_H
  24
  25 #define _STRING_H       1
  26 #include <features.h>
  27
  28 __BEGIN_DECLS
  29
  30 /* Get size_t and NULL from <stddef.h>.  */
  31 #define __need_size_t
  32 #define __need_NULL
  33 #include <stddef.h>
  34
  35
  36 /* Copy N bytes of SRC to DEST.  */
  37 extern __ptr_t memcpy __P ((__ptr_t __restrict __dest,
  38                             __const __ptr_t __restrict __src, size_t __n));
  39 /* Copy N bytes of SRC to DEST, guaranteeing
  40    correct behavior for overlapping strings.  */
  41 extern __ptr_t memmove __P ((__ptr_t __dest, __const __ptr_t __src,
  42                              size_t __n));
  43
  44 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
  45    Return the position in DEST one byte past where C was copied,
  46    or NULL if C was not found in the first N bytes of SRC.  */
  47 extern __ptr_t __memccpy __P ((__ptr_t __dest, __const __ptr_t __src,
  48                                int __c, size_t __n));
  49 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN
  50 extern __ptr_t memccpy __P ((__ptr_t __dest, __const __ptr_t __src,
  51                              int __c, size_t __n));
  52 #endif /* SVID.  */
  53
  54
  55 /* Set N bytes of S to C.  */
  56 extern __ptr_t memset __P ((__ptr_t __s, int __c, size_t __n));
  57
  58 /* Compare N bytes of S1 and S2.  */
  59 extern int memcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2,
  60                         size_t __n));
  61
  62 /* Search N bytes of S for C.  */
  63 extern __ptr_t memchr __P ((__const __ptr_t __s, int __c, size_t __n));
  64
  65
  66 /* Copy SRC to DEST.  */
  67 extern char *strcpy __P ((char *__restrict __dest,
  68                           __const char *__restrict __src));
  69 /* Copy no more than N characters of SRC to DEST.  */
  70 extern char *strncpy __P ((char *__restrict __dest,
  71                            __const char *__restrict __src, size_t __n));
  72
  73 /* Append SRC onto DEST.  */
  74 extern char *strcat __P ((char *__restrict __dest,
  75                           __const char *__restrict __src));
  76 /* Append no more than N characters from SRC onto DEST.  */
  77 extern char *strncat __P ((char *__restrict __dest,
  78                            __const char *__restrict __src, size_t __n));
  79
  80 /* Compare S1 and S2.  */
  81 extern int strcmp __P ((__const char *__s1, __const char *__s2));
  82 /* Compare N characters of S1 and S2.  */
  83 extern int strncmp __P ((__const char *__s1, __const char *__s2, size_t __n));
  84
  85 /* Compare the collated forms of S1 and S2.  */
  86 extern int strcoll __P ((__const char *__s1, __const char *__s2));
  87 /* Put a transformation of SRC into no more than N bytes of DEST.  */
  88 extern size_t strxfrm __P ((char *__restrict __dest,
  89                             __const char *__restrict __src, size_t __n));
  90
  91 #ifdef __USE_GNU
  92 /* The following functions are equivalent to the both above but they
  93    take the locale they use for the collation as an extra argument.
  94    This is not standardsized but something like will come.  */
  95 # include <xlocale.h>
  96
  97 /* Compare the collated forms of S1 and S2 using rules from L.  */
  98 extern int __strcoll_l __P ((__const char *__s1, __const char *__s2,
  99                              __locale_t __l));
 100 /* Put a transformation of SRC into no more than N bytes of DEST.  */
 101 extern size_t __strxfrm_l __P ((char *__dest, __const char *__src, size_t __n,
 102                                 __locale_t __l));
 103 #endif
 104
 105 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 106 /* Duplicate S, returning an identical malloc'd string.  */
 107 extern char *__strdup __P ((__const char *__s));
 108 extern char *strdup __P ((__const char *__s));
 109 #endif
 110
 111 /* Return a malloc'd copy of at most N bytes of STRING.  The
 112    resultant string is terminated even if no null terminator
 113    appears before STRING[N].  */
 114 extern char *__strndup __P ((__const char *__string, size_t __n));
 115 #if defined __USE_GNU
 116 extern char *strndup __P ((__const char *__string, size_t __n));
 117 #endif
 118
 119 #if defined __USE_GNU && defined __GNUC__
 120 /* Duplicate S, returning an identical alloca'd string.  */
 121 #define strdupa(s)                                                            \
 122   (__extension__                                                              \
 123     ({                                                                        \
 124       __const char *__old = (s);                                              \
 125       size_t __len = strlen (__old) + 1;                                      \
 126       char *__new = __builtin_alloca (__len);                                 \
 127       memcpy (__new, __old, __len);                                           \
 128     }))
 129
 130 /* Return an alloca'd copy of at most N bytes of string.  */
 131 #define strndupa(s, n)                                                        \
 132   (__extension__                                                              \
 133     ({                                                                        \
 134       __const char *__old = (s);                                              \
 135       size_t __len = strnlen (__old, (n));                                    \
 136       char *__new = __builtin_alloca (__len + 1);                             \
 137       __new[__len] = '\0';                                                    \
 138       memcpy (__new, __old, __len);                                           \
 139     }))
 140 #endif
 141
 142 /* Find the first occurrence of C in S.  */
 143 extern char *strchr __P ((__const char *__s, int __c));
 144 /* Find the last occurrence of C in S.  */
 145 extern char *strrchr __P ((__const char *__s, int __c));
 146
 147 /* Return the length of the initial segment of S which
 148    consists entirely of characters not in REJECT.  */
 149 extern size_t strcspn __P ((__const char *__s, __const char *__reject));
 150 /* Return the length of the initial segment of S which
 151    consists entirely of characters in ACCEPT.  */
 152 extern size_t strspn __P ((__const char *__s, __const char *__accept));
 153 /* Find the first occurrence in S of any character in ACCEPT.  */
 154 extern char *strpbrk __P ((__const char *__s, __const char *__accept));
 155 /* Find the first occurrence of NEEDLE in HAYSTACK.  */
 156 extern char *strstr __P ((__const char *__haystack, __const char *__needle));
 157 /* Divide S into tokens separated by characters in DELIM.  */
 158 extern char *strtok __P ((char *__restrict __s,
 159                           __const char *__restrict __delim));
 160
 161 #if defined __USE_POSIX || defined __USE_MISC
 162 /* Divide S into tokens separated by characters in DELIM.  Information
 163    passed between calls are stored in SAVE_PTR.  */
 164 extern char *strtok_r __P ((char *__s, __const char *__delim,
 165                             char **__save_ptr));
 166 #endif
 167
 168 #ifdef __USE_GNU
 169 /* Find the first occurrence of NEEDLE in HAYSTACK.
 170    NEEDLE is NEEDLELEN bytes long;
 171    HAYSTACK is HAYSTACKLEN bytes long.  */
 172 extern __ptr_t memmem __P ((__const __ptr_t __haystack, size_t __haystacklen,
 173                             __const __ptr_t __needle, size_t __needlelen));
 174 #endif
 175
 176
 177 /* Return the length of S.  */
 178 extern size_t strlen __P ((__const char *__s));
 179
 180 #ifdef  __USE_GNU
 181 /* Find the length of STRING, but scan at most MAXLEN characters.
 182    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 183 extern size_t strnlen __P ((__const char *__string, size_t __maxlen));
 184
 185 #ifdef  __OPTIMIZE__
 186 extern __inline size_t
 187 strnlen (__const char *__string, size_t __maxlen)
 188 {
 189   __const char *__end = (__const char *) memchr (__string, '\0', __maxlen);
 190   return __end ? __end - __string : __maxlen;
 191 }
 192 #endif
 193 #endif
 194
 195
 196 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 197 extern char *strerror __P ((int __errnum));
 198 #ifdef  __USE_MISC
 199 /* Reentrant version of `strerror'.  If a temporary buffer is required, at
 200    most BUFLEN bytes of BUF will be used.  */
 201 extern char *__strerror_r __P ((int __errnum, char *__buf, size_t __buflen));
 202 extern char *strerror_r __P ((int __errnum, char *__buf, size_t __buflen));
 203 #endif
 204
 205 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 206 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
 207 extern void bcopy __P ((__const __ptr_t __src, __ptr_t __dest, size_t __n));
 208
 209 /* Set N bytes of S to 0.  */
 210 extern void bzero __P ((__ptr_t __s, size_t __n));
 211
 212 /* Compare N bytes of S1 and S2 (same as memcmp).  */
 213 extern int bcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2, size_t __n));
 214
 215 /* Find the first occurrence of C in S (same as strchr).  */
 216 extern char *index __P ((__const char *__s, int __c));
 217
 218 /* Find the last occurrence of C in S (same as strrchr).  */
 219 extern char *rindex __P ((__const char *__s, int __c));
 220
 221 /* Return the position of the first bit set in I, or 0 if none are set.
 222    The least-significant bit is position 1, the most-significant 32.  */
 223 extern int ffs __P ((int __i));
 224
 225 /* Compare S1 and S2, ignoring case.  */
 226 extern int __strcasecmp __P ((__const char *__s1, __const char *__s2));
 227 extern int strcasecmp __P ((__const char *__s1, __const char *__s2));
 228
 229 /* Compare no more than N chars of S1 and S2, ignoring case.  */
 230 extern int __strncasecmp __P ((__const char *__s1, __const char *__s2,
 231                                size_t __n));
 232 extern int strncasecmp __P ((__const char *__s1, __const char *__s2,
 233                              size_t __n));
 234 #endif /* Use BSD or X/Open Unix.  */
 235
 236 #ifdef  __USE_BSD
 237 /* Return the next DELIM-delimited token from *STRINGP,
 238    terminating it with a '\0', and update *STRINGP to point past it.  */
 239 extern char *__strsep __P ((char **__stringp, __const char *__delim));
 240 extern char *strsep __P ((char **__stringp, __const char *__delim));
 241 #endif
 242
 243 #ifdef  __USE_GNU
 244 /* Compare S1 and S2 as strings holding name & indices/version numbers.  */
 245 extern int strverscmp __P ((__const char *__s1, __const char *__s2));
 246
 247 /* Return a string describing the meaning of the signal number in SIG.  */
 248 extern char *strsignal __P ((int __sig));
 249
 250 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
 251 extern char *__stpcpy __P ((char *__dest, __const char *__src));
 252 extern char *stpcpy __P ((char *__dest, __const char *__src));
 253
 254 /* Copy no more than N characters of SRC to DEST, returning the address of
 255    the last character written into DEST.  */
 256 extern char *__stpncpy __P ((char *__dest, __const char *__src, size_t __n));
 257 extern char *stpncpy __P ((char *__dest, __const char *__src, size_t __n));
 258
 259 /* Sautee STRING briskly.  */
 260 extern char *strfry __P ((char *__string));
 261
 262 /* Frobnicate N bytes of S.  */
 263 extern __ptr_t memfrob __P ((__ptr_t __s, size_t __n));
 264 #endif
 265
 266 #if defined __USE_MISC || !defined basename
 267 /* Return the file name within directory of FILENAME.  We don't
 268    declare the function if the `basename' macro is available (defined
 269    in <libgen.h>) which makes the XPG version of this function
 270    available.  */
 271 extern char *basename __P ((__const char *__filename));
 272 #endif
 273
 274 __END_DECLS
 275
 276 #endif /* string.h  */