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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libiberty/memchr.c
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Diffstat (limited to 'libiberty/memchr.c')
-rw-r--r--libiberty/memchr.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/libiberty/memchr.c b/libiberty/memchr.c
new file mode 100644
index 000000000..7448ab9e7
--- /dev/null
+++ b/libiberty/memchr.c
@@ -0,0 +1,33 @@
+/*
+
+@deftypefn Supplemental void* memchr (const void *@var{s}, int @var{c}, @
+ size_t @var{n})
+
+This function searches memory starting at @code{*@var{s}} for the
+character @var{c}. The search only ends with the first occurrence of
+@var{c}, or after @var{length} characters; in particular, a null
+character does not terminate the search. If the character @var{c} is
+found within @var{length} characters of @code{*@var{s}}, a pointer
+to the character is returned. If @var{c} is not found, then @code{NULL} is
+returned.
+
+@end deftypefn
+
+*/
+
+#include <ansidecl.h>
+#include <stddef.h>
+
+PTR
+memchr (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;
+}