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+/*
+FUNCTION
+ <<memchr>>---find character in memory
+
+INDEX
+ memchr
+
+ANSI_SYNOPSIS
+ #include <string.h>
+ void *memchr(const void *<[src]>, int <[c]>, size_t <[length]>);
+
+TRAD_SYNOPSIS
+ #include <string.h>
+ void *memchr(<[src]>, <[c]>, <[length]>)
+ void *<[src]>;
+ void *<[c]>;
+ size_t <[length]>;
+
+DESCRIPTION
+ This function searches memory starting at <<*<[src]>>> for the
+ character <[c]>. The search only ends with the first
+ occurrence of <[c]>, or after <[length]> characters; in
+ particular, <<NULL>> does not terminate the search.
+
+RETURNS
+ If the character <[c]> is found within <[length]> characters
+ of <<*<[src]>>>, a pointer to the character is returned. If
+ <[c]> is not found, then <<NULL>> is returned.
+
+PORTABILITY
+<<memchr>> requires no supporting OS subroutines.
+
+QUICKREF
+ memchr ansi pure
+
+*/
+
+#include <ansidecl.h>
+#ifdef __STDC__
+#include <stddef.h>
+#else
+#define size_t unsigned long
+#endif
+
+PTR
+memchr (src_void, c, length)
+ register const PTR src_void;
+ int c;
+ size_t length;
+{
+ const unsigned char *src = (const unsigned char *)src_void;
+
+ while (--length >= 0)
+ {
+ if (*src == c)
+ return (PTR)src;
+ src++;
+ }
+ return NULL;
+}