Userspace dlmalloc port, supporting syscalls mman_map()/mman_unmap()

ulib/string/string.c

@@ -9,3 +9,105 @@ size_t string_len(const char *s) {
   }
   return l;
 }
+
+void *string_memset(void *p, int c, size_t n) {
+  char *cp = p;
+  for (size_t i = 0; i < n; i++) cp[i] = c;
+  return p;
+}
+
+void *string_memcpy(void *dst, const void *src, size_t n) {
+  char *a = dst;
+  const char *b = src;
+  for (size_t i = 0; i < n; i++) a[i] = b[i];
+  return dst;
+}
+
+// https://aticleworld.com/memcmp-in-c/
+int string_memcmp(const void *s1, const void *s2, int len)
+{
+    unsigned char *p = s1;
+    unsigned char *q = s2;
+    int charCompareStatus = 0;
+    //If both pointer pointing same memory block
+    if (s1 == s2)
+    {
+        return charCompareStatus;
+    }
+    while (len > 0)
+    {
+        if (*p != *q)
+        {  //compare the mismatching character
+            charCompareStatus = (*p >*q)?1:-1;
+            break;
+        }
+        len--;
+        p++;
+        q++;
+    }
+    return charCompareStatus;
+}
+
+int string_strcmp(const char *a, const char *b) {
+  while (*a && (*a == *b)) {
+    a++, b++;
+  }
+  return (unsigned char)*a - (unsigned char)*b;
+}
+
+size_t string_strcspn(const char *s, const char *reject) {
+    size_t count = 0;
+    for (; *s != '\0'; ++s) {
+        const char *r = reject;
+        while (*r != '\0') {
+            if (*s == *r) {
+                return count;
+            }
+            r++;
+        }
+        count++;
+    }
+    return count;
+}
+
+size_t string_strspn(const char *s, const char *accept) {
+    size_t count = 0;
+    for (; *s != '\0'; ++s) {
+        const char *a = accept;
+        int matched = 0;
+        while (*a != '\0') {
+            if (*s == *a) {
+                matched = 1;
+                break;
+            }
+            a++;
+        }
+        if (!matched) {
+            return count;
+        }
+        count++;
+    }
+    return count;
+}
+
+char *string_strcpy(char *dest, const char *src) {
+    char *d = dest;
+    while ((*d++ = *src++) != '\0') {
+        ;
+    }
+    return dest;
+}
+
+char *string_strchr(const char *s, int c) {
+    char ch = (char)c;
+    while (*s != '\0') {
+        if (*s == ch) {
+            return (char *)s;
+        }
+        s++;
+    }
+    if (ch == '\0') {
+        return (char *)s;
+    }
+    return NULL;
+}

ulib/string/string.h

@@ -1,8 +1,24 @@
 #ifndef ULIB_STRING_STRING_H_
 #define ULIB_STRING_STRING_H_
 
+#if !defined(__ASSEMBLER__)
+
 #include <stddef.h>
+#include <stdint.h>
+
+#define memset string_memset
+#define memcpy string_memcpy
 
 size_t string_len(const char *s);
+void *string_memset(void *p, int c, size_t n);
+void *string_memcpy(void *dst, const void *src, size_t n);
+int string_memcmp(const void *s1, const void *s2, int len);
+int string_strcmp(const char *a, const char *b);
+size_t string_strcspn(const char *s, const char *reject);
+size_t string_strspn(const char *s, const char *accept);
+char *string_strcpy(char *dest, const char *src);
+char *string_strchr(const char *s, int c);
+
+#endif
 
 #endif // ULIB_STRING_STRING_H_