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Annotation of GNUtools/libg++/libiberty/memchr.c, revision 1.1.1.1

1.1       root        1: /*
                      2: FUNCTION
                      3:        <<memchr>>---find character in memory
                      4: 
                      5: INDEX
                      6:        memchr
                      7: 
                      8: ANSI_SYNOPSIS
                      9:        #include <string.h>
                     10:        void *memchr(const void *<[src]>, int <[c]>, size_t <[length]>);
                     11: 
                     12: TRAD_SYNOPSIS
                     13:        #include <string.h>
                     14:        void *memchr(<[src]>, <[c]>, <[length]>)
                     15:        void *<[src]>;
                     16:        void *<[c]>;
                     17:        size_t <[length]>;
                     18: 
                     19: DESCRIPTION
                     20:        This function searches memory starting at <<*<[src]>>> for the
                     21:        character <[c]>.  The search only ends with the first
                     22:        occurrence of <[c]>, or after <[length]> characters; in
                     23:        particular, <<NULL>> does not terminate the search.
                     24: 
                     25: RETURNS
                     26:        If the character <[c]> is found within <[length]> characters
                     27:        of <<*<[src]>>>, a pointer to the character is returned. If
                     28:        <[c]> is not found, then <<NULL>> is returned.  
                     29: 
                     30: PORTABILITY
                     31: <<memchr>>  requires no supporting OS subroutines.
                     32: 
                     33: QUICKREF
                     34:        memchr ansi pure
                     35: 
                     36: */
                     37: 
                     38: #include <ansidecl.h>
                     39: #ifdef __STDC__
                     40: #include <stddef.h>
                     41: #else
                     42: #define size_t unsigned long
                     43: #endif
                     44: 
                     45: PTR
                     46: memchr (src_void, c, length)
                     47:      register CONST PTR src_void;
                     48:      int c;
                     49:      size_t length;
                     50: {
                     51:   CONST unsigned char *src = (CONST unsigned char *)src_void;
                     52:   
                     53:   while (--length >= 0)
                     54:   {
                     55:     if (*src == c)
                     56:      return (PTR)src;
                     57:     src++;
                     58:   }
                     59:   return NULL;
                     60: }

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