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authorThomas Martitz <kugel@rockbox.org>2010-05-06 21:04:40 +0000
committerThomas Martitz <kugel@rockbox.org>2010-05-06 21:04:40 +0000
commit50a6ca39ad4ed01922aa4f755f0ca579788226cf (patch)
treec7881b015b220558167310345b162324c96be15a /firmware/libc/strcpy.c
parentadb506df14aded06ed6e9ebf8540e6fd383ffd6a (diff)
downloadrockbox-50a6ca39ad4ed01922aa4f755f0ca579788226cf.tar.gz
rockbox-50a6ca39ad4ed01922aa4f755f0ca579788226cf.zip
Move c/h files implementing/defining standard library stuff into a new libc directory, also standard'ify some parts of the code base (almost entirely #include fixes).
This is to a) to cleanup firmware/common and firmware/include a bit, but also b) for Rockbox as an application which should use the host system's c library and headers, separating makes it easy to exclude our files from the build. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25850 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/libc/strcpy.c')
-rw-r--r--firmware/libc/strcpy.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/firmware/libc/strcpy.c b/firmware/libc/strcpy.c
new file mode 100644
index 0000000000..077ae73cc6
--- /dev/null
+++ b/firmware/libc/strcpy.c
@@ -0,0 +1,99 @@
+/*
+FUNCTION
+ <<strcpy>>---copy string
+
+INDEX
+ strcpy
+
+ANSI_SYNOPSIS
+ #include <string.h>
+ char *strcpy(char *<[dst]>, const char *<[src]>);
+
+TRAD_SYNOPSIS
+ #include <string.h>
+ char *strcpy(<[dst]>, <[src]>)
+ char *<[dst]>;
+ char *<[src]>;
+
+DESCRIPTION
+ <<strcpy>> copies the string pointed to by <[src]>
+ (including the terminating null character) to the array
+ pointed to by <[dst]>.
+
+RETURNS
+ This function returns the initial value of <[dst]>.
+
+PORTABILITY
+<<strcpy>> is ANSI C.
+
+<<strcpy>> requires no supporting OS subroutines.
+
+QUICKREF
+ strcpy ansi pure
+*/
+
+#include <string.h>
+#include <limits.h>
+
+/*SUPPRESS 560*/
+/*SUPPRESS 530*/
+
+/* Nonzero if either X or Y is not aligned on a "long" boundary. */
+#define UNALIGNED(X, Y) \
+ (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
+
+#if LONG_MAX == 2147483647L
+#define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
+#else
+#if LONG_MAX == 9223372036854775807L
+/* Nonzero if X (a long int) contains a NULL byte. */
+#define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080)
+#else
+#error long int is not a 32bit or 64bit type.
+#endif
+#endif
+
+#ifndef DETECTNULL
+#error long int is not a 32bit or 64bit byte
+#endif
+
+char*
+_DEFUN (strcpy, (dst0, src0),
+ char *dst0 _AND
+ _CONST char *src0)
+{
+#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
+ char *s = dst0;
+
+ while ((*dst0++ = *src0++))
+ ;
+
+ return s;
+#else
+ char *dst = dst0;
+ _CONST char *src = src0;
+ long *aligned_dst;
+ _CONST long *aligned_src;
+
+ /* If SRC or DEST is unaligned, then copy bytes. */
+ if (!UNALIGNED (src, dst))
+ {
+ aligned_dst = (long*)dst;
+ aligned_src = (long*)src;
+
+ /* SRC and DEST are both "long int" aligned, try to do "long int"
+ sized copies. */
+ while (!DETECTNULL(*aligned_src))
+ {
+ *aligned_dst++ = *aligned_src++;
+ }
+
+ dst = (char*)aligned_dst;
+ src = (char*)aligned_src;
+ }
+
+ while ((*dst++ = *src++))
+ ;
+ return dst0;
+#endif /* not PREFER_SIZE_OVER_SPEED */
+}