string/string.h

   1 /* Copyright (C) 1991, 92, 93, 95, 96 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      ANSI 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 __dest, __const __ptr_t __src,
  38                             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)
  50 extern __ptr_t memccpy __P ((__ptr_t __dest, __const __ptr_t __src,
  51                              int __c, size_t __n));
  52 #ifdef  __OPTIMIZE__
  53 #define memccpy(dest, src, c, n) __memccpy((dest), (src), (c), (n))
  54 #endif /* Optimizing.  */
  55 #endif /* SVID.  */
  56
  57
  58 /* Set N bytes of S to C.  */
  59 extern __ptr_t memset __P ((__ptr_t __s, int __c, size_t __n));
  60
  61 /* Compare N bytes of S1 and S2.  */
  62 extern int memcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2,
  63                         size_t __n));
  64
  65 /* Search N bytes of S for C.  */
  66 extern __ptr_t memchr __P ((__const __ptr_t __s, int __c, size_t __n));
  67
  68
  69 /* Copy SRC to DEST.  */
  70 extern char *strcpy __P ((char *__dest, __const char *__src));
  71 /* Copy no more than N characters of SRC to DEST.  */
  72 extern char *strncpy __P ((char *__dest, __const char *__src, size_t __n));
  73
  74 /* Append SRC onto DEST.  */
  75 extern char *strcat __P ((char *__dest, __const char *__src));
  76 /* Append no more than N characters from SRC onto DEST.  */
  77 extern char *strncat __P ((char *__dest, __const char *__src, size_t __n));
  78
  79 /* Compare S1 and S2.  */
  80 extern int strcmp __P ((__const char *__s1, __const char *__s2));
  81 /* Compare N characters of S1 and S2.  */
  82 extern int strncmp __P ((__const char *__s1, __const char *__s2, size_t __n));
  83
  84 /* Compare the collated forms of S1 and S2.  */
  85 extern int strcoll __P ((__const char *__s1, __const char *__s2));
  86 /* Put a transformation of SRC into no more than N bytes of DEST.  */
  87 extern size_t strxfrm __P ((char *__dest, __const char *__src, size_t __n));
  88
  89 #if defined (__USE_SVID) || defined (__USE_BSD)
  90 /* Duplicate S, returning an identical malloc'd string.  */
  91 extern char *strdup __P ((__const char *__s));
  92 #endif
  93
  94 #if defined (__USE_GNU) && defined (__GNUC__)
  95 /* Duplicate S, returning an identical alloca'd string.  */
  96 #define strdupa(s)                                                            \
  97 ({                                                                            \
  98     const char *__old = (s);                                                  \
  99     size_t __len = strlen (__old) + 1;                                        \
 100     memcpy (__builtin_alloca (__len), __old, __len);                          \
 101 })
 102 #endif
 103
 104 /* Find the first occurrence of C in S.  */
 105 extern char *strchr __P ((__const char *__s, int __c));
 106 /* Find the last occurrence of C in S.  */
 107 extern char *strrchr __P ((__const char *__s, int __c));
 108
 109 /* Return the length of the initial segment of S which
 110    consists entirely of characters not in REJECT.  */
 111 extern size_t strcspn __P ((__const char *__s, __const char *__reject));
 112 /* Return the length of the initial segment of S which
 113    consists entirely of characters in ACCEPT.  */
 114 extern size_t strspn __P ((__const char *__s, __const char *__accept));
 115 /* Find the first occurence in S of any character in ACCEPT.  */
 116 extern char *strpbrk __P ((__const char *__s, __const char *__accept));
 117 /* Find the first occurence of NEEDLE in HAYSTACK.  */
 118 extern char *strstr __P ((__const char *__haystack, __const char *__needle));
 119 /* Divide S into tokens separated by characters in DELIM.  */
 120 extern char *strtok __P ((char *__s, __const char *__delim));
 121
 122 #ifdef  __USE_GNU
 123 /* Divide S into tokens separated by characters in DELIM.  Information
 124    passed between calls are stored in SAVE_PTR.  */
 125 extern char *strtok_r __P ((char *__s, __const char *__delim,
 126                             char **__save_ptr));
 127
 128 /* Find the first occurence of NEEDLE in HAYSTACK.
 129    NEEDLE is NEEDLELEN bytes long;
 130    HAYSTACK is HAYSTACKLEN bytes long.  */
 131 extern __ptr_t memmem __P ((__const __ptr_t __haystack, size_t __haystacklen,
 132                             __const __ptr_t __needle, size_t __needlelen));
 133 #endif
 134
 135
 136 /* Return the length of S.  */
 137 extern size_t strlen __P ((__const char *__s));
 138
 139 #ifdef  __USE_GNU
 140 /* Find the length of STRING, but scan at most MAXLEN characters.
 141    If no '\0' terminator is found in that many characters, return MAXLEN.  */
 142 extern size_t strnlen __P ((__const char *__string, size_t __maxlen));
 143
 144 #ifdef  __OPTIMIZE__
 145 extern __inline size_t
 146 strnlen (__const char *__string, size_t __maxlen)
 147 {
 148   __const char *__end = memchr (__string, '\0', __maxlen);
 149   return __end ? __end - __string : __maxlen;
 150 }
 151 #endif
 152 #endif
 153
 154
 155 /* Return a string describing the meaning of the `errno' code in ERRNUM.  */
 156 extern char *strerror __P ((int __errnum));
 157 #ifdef  __USE_REENTRANT
 158 /* Reentrant version of `strerror'.  If a temporary buffer is required, at
 159    most BUFLEN bytes of BUF will be used.  */
 160 extern char *strerror_r __P ((int __errnum, char *__buf, int __buflen));
 161 #endif
 162
 163 #ifdef  __USE_BSD
 164 /* Find the first occurrence of C in S (same as strchr).  */
 165 extern char *index __P ((__const char *__s, int __c));
 166
 167 /* Find the last occurrence of C in S (same as strrchr).  */
 168 extern char *rindex __P ((__const char *__s, int __c));
 169
 170 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
 171 extern void bcopy __P ((__const __ptr_t __src, __ptr_t __dest, size_t __n));
 172
 173 /* Set N bytes of S to 0.  */
 174 extern void bzero __P ((__ptr_t __s, size_t __n));
 175
 176 /* Compare N bytes of S1 and S2 (same as memcmp).  */
 177 extern int bcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2, size_t __n));
 178
 179 /* Return the position of the first bit set in I, or 0 if none are set.
 180    The least-significant bit is position 1, the most-significant 32.  */
 181 extern int ffs __P ((int __i));
 182
 183 /* Compare S1 and S2, ignoring case.  */
 184 extern int __strcasecmp __P ((__const char *__s1, __const char *__s2));
 185 extern int strcasecmp __P ((__const char *__s1, __const char *__s2));
 186
 187 /* Return the next DELIM-delimited token from *STRINGP,
 188    terminating it with a '\0', and update *STRINGP to point past it.  */
 189 extern char *strsep __P ((char **__stringp, __const char *__delim));
 190 #endif
 191
 192 #ifdef  __USE_GNU
 193 /* Compare no more than N chars of S1 and S2, ignoring case.  */
 194 extern int strncasecmp __P ((__const char *__s1, __const char *__s2,
 195                              size_t __n));
 196
 197 /* Return a string describing the meaning of the signal number in SIG.  */
 198 extern char *strsignal __P ((int __sig));
 199
 200 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
 201 extern char *__stpcpy __P ((char *__dest, __const char *__src));
 202 extern char *stpcpy __P ((char *__dest, __const char *__src));
 203
 204 /* Copy no more than N characters of SRC to DEST, returning the address of
 205    the last character written into DEST.  */
 206 extern char *__stpncpy __P ((char *__dest, __const char *__src, size_t __n));
 207 extern char *stpncpy __P ((char *__dest, __const char *__src, size_t __n));
 208
 209 /* Sautee STRING briskly.  */
 210 extern char *strfry __P ((char *__string));
 211
 212 /* Frobnicate N bytes of S.  */
 213 extern __ptr_t memfrob __P ((__ptr_t __s, size_t __n));
 214 #endif
 215
 216 #ifdef  __USE_MISC
 217 /* Return the file name within directory of FILENAME.  */
 218 extern char *basename __P ((__const char *filename));
 219 #endif
 220
 221 __END_DECLS
 222
 223 #endif /* string.h  */