Initial Upload

ulib.c

@@ -0,0 +1,98 @@
+#include "types.h"
+#include "stat.h"
+#include "fcntl.h"
+#include "user.h"
+#include "x86.h"
+
+char*strcpy(char *s, const char *t) {
+    char *os;
+
+    os = s;
+    while ((*s++ = *t++) != 0) {
+        ;
+    }
+    return os;
+}
+
+int strcmp(const char *p, const char *q) {
+    while (*p && *p == *q) {
+        p++, q++;
+    }
+    return (uchar) * p - (uchar) * q;
+}
+
+uint strlen(const char *s)      {
+    int n;
+
+    for (n = 0; s[n]; n++) {
+        ;
+    }
+    return n;
+}
+
+void* memset(void *dst, int c, uint n) {
+    stosb(dst, c, n);
+    return dst;
+}
+
+char* strchr(const char *s, char c) {
+    for (; *s; s++) {
+        if (*s == c) {
+            return (char*)s;
+        }
+    }
+    return 0;
+}
+
+char* gets(char *buf, int max) {
+    int i, cc;
+    char c;
+
+    for (i = 0; i + 1 < max;) {
+        cc = read(0, &c, 1);
+        if (cc < 1) {
+            break;
+        }
+        buf[i++] = c;
+        if (c == '\n' || c == '\r') {
+            break;
+        }
+    }
+    buf[i] = '\0';
+    return buf;
+}
+
+int stat(const char *n, struct stat *st) {
+    int fd;
+    int r;
+
+    fd = open(n, O_RDONLY);
+    if (fd < 0) {
+        return -1;
+    }
+    r = fstat(fd, st);
+    close(fd);
+    return r;
+}
+
+int atoi(const char *s) {
+    int n;
+
+    n = 0;
+    while ('0' <= *s && *s <= '9') {
+        n = n * 10 + *s++ - '0';
+    }
+    return n;
+}
+
+void* memmove(void *vdst, const void *vsrc, int n) {
+    char *dst;
+    const char *src;
+
+    dst = vdst;
+    src = vsrc;
+    while (n-- > 0) {
+        *dst++ = *src++;
+    }
+    return vdst;
+}