source: branches/reconfiguration/softs/libs/string.c @ 1019

Last change on this file since 1019 was 850, checked in by cfuguet, 10 years ago

reconf: introducing a softs directory in the reconfiguration branch

  • This softs directory contains a minimalistic (giet-like) library of drivers and some utility functions.
  • Introducing a simple unit test in the vci_cc_vcache_wrapper component to test the newly introduced watchdog timer mechanism. This unit test uses the minimalistic library.
File size: 1.1 KB
Line 
1/**
2 * \file    string.c
3 * \date    July 8, 2014
4 * \author  Cesar Fuguet
5 *
6 * \brief   string utility functions
7 */
8#include <string.h>
9
10void *memset(void *_dst, int c, size_t len)
11{
12    const char val = (char)c;
13
14    /*
15     * Write 12 bytes when destination buffer is aligned to 4 bytes and length
16     * is greater or equal to 12
17     */
18    int *dst = _dst;
19    if (!((int)dst & 0x3)) {
20        const int word = (val << 24) | (val << 16) | (val << 8) | val;
21        while (len > 11) {
22            dst[0] = word;
23            dst[1] = word;
24            dst[2] = word;
25            len -= 12;
26            dst += 3;
27        }
28    }
29
30    /*
31     * Write 1 byte when destination buffer is not aligned to 4 bytes or length
32     * is smaller than 4
33     */
34    char *cdst = (char *)dst;
35    while (len--) {
36        *cdst++ = val;
37    }
38
39    return _dst;
40}
41
42void *memcpy(void *_dst, const void *_src, size_t n)
43{
44    uint8_t *cdst = (uint8_t *)_dst;
45    uint8_t *csrc = (uint8_t *)_src;
46    while (n--) {
47        *cdst++ = *csrc++;
48    }
49    return _dst;
50};
51
52/*
53 * vim: tabstop=4 : softtabstop=4 : shiftwidth=4 : expandtab
54 */
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