124 lines
1.7 KiB
C
124 lines
1.7 KiB
C
#include "kernel/types.h"
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#include "kernel/stat.h"
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#include "kernel/fcntl.h"
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#include "user/user.h"
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//
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// wrapper so that it's OK if main() does not call exit().
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//
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void _main() {
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extern int main();
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main();
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exit(0);
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}
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char *strcpy(char *s, const char *t) {
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char *os;
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os = s;
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while ((*s++ = *t++) != 0)
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;
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return os;
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}
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int strcmp(const char *p, const char *q) {
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while (*p && *p == *q)
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p++, q++;
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return (uchar)*p - (uchar)*q;
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}
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uint strlen(const char *s) {
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int n;
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for (n = 0; s[n]; n++)
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;
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return n;
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}
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void *memset(void *dst, int c, uint n) {
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char *cdst = (char *)dst;
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int i;
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for (i = 0; i < n; i++) {
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cdst[i] = c;
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}
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return dst;
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}
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char *strchr(const char *s, char c) {
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for (; *s; s++)
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if (*s == c)
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return (char *)s;
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return 0;
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}
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char *gets(char *buf, int max) {
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int i, cc;
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char c;
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for (i = 0; i + 1 < max;) {
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cc = read(0, &c, 1);
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if (cc < 1)
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break;
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buf[i++] = c;
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if (c == '\n' || c == '\r')
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break;
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}
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buf[i] = '\0';
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return buf;
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}
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int stat(const char *n, struct stat *st) {
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int fd;
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int r;
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fd = open(n, O_RDONLY);
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if (fd < 0)
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return -1;
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r = fstat(fd, st);
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close(fd);
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return r;
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}
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int atoi(const char *s) {
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int n;
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n = 0;
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while ('0' <= *s && *s <= '9')
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n = n * 10 + *s++ - '0';
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return n;
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}
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void *memmove(void *vdst, const void *vsrc, int n) {
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char *dst;
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const char *src;
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dst = vdst;
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src = vsrc;
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if (src > dst) {
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while (n-- > 0)
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*dst++ = *src++;
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} else {
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dst += n;
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src += n;
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while (n-- > 0)
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*--dst = *--src;
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}
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return vdst;
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}
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int memcmp(const void *s1, const void *s2, uint n) {
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const char *p1 = s1, *p2 = s2;
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while (n-- > 0) {
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if (*p1 != *p2) {
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return *p1 - *p2;
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}
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p1++;
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p2++;
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}
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return 0;
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}
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void *memcpy(void *dst, const void *src, uint n) {
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return memmove(dst, src, n);
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}
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