Add zealbooter library files for strcpy, strncpy, strcmp, strncmp, strlen.

zealbooter/lib.h

@@ -6,6 +6,11 @@
 #include <memset.h>
 #include <memmove.h>
 #include <memcmp.h>
+#include <strcpy.h>
+#include <strncpy.h>
+#include <strcmp.h>
+#include <strncmp.h>
+#include <strlen.h>
 #include <print.h>
 
 uint64_t div_roundup_u64(uint64_t a, uint64_t b);

zealbooter/lib/strcmp.c

@@ -0,0 +1,19 @@
+/* strcmp( const char *, const char * )
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+int strcmp(const char *s1, const char *s2)
+{
+    while ((*s1) && (*s1 == *s2))
+    {
+        ++s1;
+        ++s2;
+    }
+
+    return (*(unsigned char *)s1 - *(unsigned char *)s2);
+}
+
+

zealbooter/lib/strcmp.h

@@ -0,0 +1,6 @@
+#ifndef __STRCMP_H__
+#define __STRCMP_H__
+
+int strcmp(const char *s1, const char *s2);
+
+#endif // __STRCMP_H__

zealbooter/lib/strcpy.c

@@ -0,0 +1,19 @@
+/* strcpy( char *, const char * )
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+char *strcpy(char *s1, const char *s2)
+{
+    char *rc = s1;
+
+    while ((*s1++ = *s2++))
+    {
+        /* EMPTY */
+    }
+
+    return rc;
+}
+

zealbooter/lib/strcpy.h

@@ -0,0 +1,6 @@
+#ifndef __STRCPY_H__
+#define __STRCPY_H__
+
+char *strcpy(char *s1, const char *s2);
+
+#endif // __STRCPY_H__

zealbooter/lib/strlen.c

@@ -0,0 +1,19 @@
+/* strlen( const char * )
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+size_t strlen(const char *s)
+{
+    size_t rc = 0;
+
+    while (s[rc])
+    {
+        ++rc;
+    }
+
+    return rc;
+}
+

zealbooter/lib/strlen.h

@@ -0,0 +1,6 @@
+#ifndef __STRLEN_H__
+#define __STRLEN_H__
+
+size_t strlen(const char *s);
+
+#endif // __STRLEN_H__

zealbooter/lib/strncmp.c

@@ -0,0 +1,26 @@
+/* strncmp( const char *, const char *, size_t )
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+int strncmp(const char *s1, const char *s2, size_t n)
+{
+    while (n && *s1 && (*s1 == *s2))
+    {
+        ++s1;
+        ++s2;
+        --n;
+    }
+
+    if (n == 0)
+    {
+        return 0;
+    }
+    else
+    {
+        return (*(unsigned char *)s1 - *(unsigned char *)s2);
+    }
+}
+

zealbooter/lib/strncmp.h

@@ -0,0 +1,6 @@
+#ifndef __STRNCMP_H__
+#define __STRNCMP_H__
+
+int strncmp(const char *s1, const char *s2, size_t n);
+
+#endif // __STRNCMP_H__

zealbooter/lib/strncpy.c

@@ -0,0 +1,31 @@
+/* strncpy( char *, const char *, size_t )
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+
+char *strncpy(char *s1, const char *s2, size_t n)
+{
+    char *rc = s1;
+
+    while (n && (*s1++ = *s2++))
+    {
+        /* Cannot do "n--" in the conditional as size_t is unsigned and we have
+           to check it again for >0 in the next loop below, so we must not risk
+           underflow.
+        */
+        --n;
+    }
+
+    /* Checking against 1 as we missed the last --n in the loop above. */
+    while (n-- > 1)
+    {
+        *s1++ = '\0';
+    }
+
+    return rc;
+}
+
+

zealbooter/lib/strncpy.h

@@ -0,0 +1,6 @@
+#ifndef __STRNCPY_H__
+#define __STRNCPY_H__
+
+char *strncpy(char *s1, const char *s2, size_t n);
+
+#endif // __STRNCPY_H__