Espresso 0.0.2c

libc/string.c

@@ -0,0 +1,125 @@
+#include <stdint.h>
+#include <stddef.h>
+
+#include "include/string.h"
+
+size_t strlen(const char* str)
+{
+    size_t len = 0;
+    while (str[len])
+    {
+        len++;
+    }
+    return len;
+}
+
+int strcmp(const char *s1, const char *s2)
+{
+    while (*s1 && (*s1 == *s2))
+    {
+        s1++;
+        s2++;
+    }
+    return (unsigned char)*s1 - (unsigned char)*s2;
+}
+
+int strncmp(const char *s1, const char *s2, size_t n)
+{
+    while (n--)
+    {
+        unsigned char c1 = (unsigned char)*s1++;
+        unsigned char c2 = (unsigned char)*s2++;
+        if (c1 != c2)
+        {
+            return c1 - c2;
+        }
+        if (c1 == '\0')
+        {
+            break;
+        }
+    }
+    return 0;
+}
+
+char* strcpy(char *dst, const char *src)
+{
+  char *ret = dst;
+  while ((*dst++ = *src++) != 0);
+  return ret;
+}
+
+char* strncpy(char *dest, const char *src, uint32_t n)
+{
+    uint32_t i = 0;
+    for (; i < n && src[i]; ++i)
+    {
+        dest[i] = src[i];
+    }
+
+    for (; i < n; ++i)
+    {
+        dest[i] = '\0';
+    }
+
+    return dest;
+}
+
+char* strcat(char *dest, const char *src)
+{
+    char *end = dest + strlen(dest);
+    while (*src)
+    {
+        *end++ = *src++;
+    }
+  
+    *end = '\0';
+    return dest;
+}
+
+
+/*char* strdup(const char* s)
+{
+    if (!s)
+    {
+        return NULL;
+    }
+
+    size_t len = strlen(s);
+    char* copy = (char*)malloc(len + 1);
+
+    if (!copy)
+    {
+        return NULL;
+    }
+
+    memcpy(copy, s, len);
+    copy[len] = '\0';
+
+    return copy;
+}*/
+
+void* memset(void* dst, int c, size_t n)
+{
+    unsigned char* temp = (unsigned char*) dst;
+    unsigned char val = (unsigned char) c;
+
+    for (size_t i = 0; i < n; i++)
+    {
+        temp[i] = val;
+    }
+
+    return dst;
+}
+
+
+void* memcpy(void *dst, const void *src, uint32_t n)
+{
+    char *d = dst;
+    const char *s = src;
+    while (n--)
+    {
+        *d++ = *s++;
+    }
+  
+    return dst;
+}