first commit

kernel/string.c

@@ -0,0 +1,107 @@
+#include "types.h"
+
+void*
+memset(void *dst, int c, uint n)
+{
+  char *cdst = (char *) dst;
+  int i;
+  for(i = 0; i < n; i++){
+    cdst[i] = c;
+  }
+  return dst;
+}
+
+int
+memcmp(const void *v1, const void *v2, uint n)
+{
+  const uchar *s1, *s2;
+
+  s1 = v1;
+  s2 = v2;
+  while(n-- > 0){
+    if(*s1 != *s2)
+      return *s1 - *s2;
+    s1++, s2++;
+  }
+
+  return 0;
+}
+
+void*
+memmove(void *dst, const void *src, uint n)
+{
+  const char *s;
+  char *d;
+
+  if(n == 0)
+    return dst;
+  
+  s = src;
+  d = dst;
+  if(s < d && s + n > d){
+    s += n;
+    d += n;
+    while(n-- > 0)
+      *--d = *--s;
+  } else
+    while(n-- > 0)
+      *d++ = *s++;
+
+  return dst;
+}
+
+// memcpy exists to placate GCC.  Use memmove.
+void*
+memcpy(void *dst, const void *src, uint n)
+{
+  return memmove(dst, src, n);
+}
+
+int
+strncmp(const char *p, const char *q, uint n)
+{
+  while(n > 0 && *p && *p == *q)
+    n--, p++, q++;
+  if(n == 0)
+    return 0;
+  return (uchar)*p - (uchar)*q;
+}
+
+char*
+strncpy(char *s, const char *t, int n)
+{
+  char *os;
+
+  os = s;
+  while(n-- > 0 && (*s++ = *t++) != 0)
+    ;
+  while(n-- > 0)
+    *s++ = 0;
+  return os;
+}
+
+// Like strncpy but guaranteed to NUL-terminate.
+char*
+safestrcpy(char *s, const char *t, int n)
+{
+  char *os;
+
+  os = s;
+  if(n <= 0)
+    return os;
+  while(--n > 0 && (*s++ = *t++) != 0)
+    ;
+  *s = 0;
+  return os;
+}
+
+int
+strlen(const char *s)
+{
+  int n;
+
+  for(n = 0; s[n]; n++)
+    ;
+  return n;
+}
+