Initial revision

strlcpy.c

@@ -0,0 +1,84 @@
+/********************************************************************\
+
+   Name:         strlcpy.c
+   Created by:   Stefan Ritt
+
+   Contents:     Contains strlcpy and strlcat which are versions of
+                 strcpy and strcat, but which avoid buffer overflows
+
+   $Log$
+   Revision 1.1  2005/05/09 09:12:03  ritt
+   Initial revision
+
+\********************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include "strlcpy.h"
+
+/*
+* Copy src to string dst of size siz.  At most siz-1 characters
+* will be copied.  Always NUL terminates (unless size == 0).
+* Returns strlen(src); if retval >= siz, truncation occurred.
+*/
+size_t strlcpy(char *dst, const char *src, size_t size)
+{
+   char *d = dst;
+   const char *s = src;
+   size_t n = size;
+
+   /* Copy as many bytes as will fit */
+   if (n != 0 && --n != 0) {
+      do {
+         if ((*d++ = *s++) == 0)
+            break;
+      } while (--n != 0);
+   }
+
+   /* Not enough room in dst, add NUL and traverse rest of src */
+   if (n == 0) {
+      if (size != 0)
+         *d = '\0';             /* NUL-terminate dst */
+      while (*s++);
+   }
+
+   return (s - src - 1);        /* count does not include NUL */
+}
+
+/*-------------------------------------------------------------------*/
+
+/*
+* Appends src to string dst of size siz (unlike strncat, siz is the
+* full size of dst, not space left).  At most siz-1 characters
+* will be copied.  Always NUL terminates (unless size <= strlen(dst)).
+* Returns strlen(src) + MIN(size, strlen(initial dst)).
+* If retval >= size, truncation occurred.
+*/
+size_t strlcat(char *dst, const char *src, size_t size)
+{
+   char *d = dst;
+   const char *s = src;
+   size_t n = size;
+   size_t dlen;
+
+   /* Find the end of dst and adjust bytes left but don't go past end */
+   while (n-- != 0 && *d != '\0')
+      d++;
+   dlen = d - dst;
+   n = size - dlen;
+
+   if (n == 0)
+      return (dlen + strlen(s));
+   while (*s != '\0') {
+      if (n != 1) {
+         *d++ = *s;
+         n--;
+      }
+      s++;
+   }
+   *d = '\0';
+
+   return (dlen + (s - src));   /* count does not include NUL */
+}
+
+/*-------------------------------------------------------------------*/

strlcpy.h

@@ -0,0 +1,23 @@
+/********************************************************************\
+
+   Name:         strlcpy.h
+   Created by:   Stefan Ritt
+
+   Contents:     Header file for strlcpy.c
+
+   $Log$
+   Revision 1.1  2005/05/09 09:12:06  ritt
+   Initial revision
+
+\********************************************************************/
+
+#ifndef EXPRT
+#if defined(EXPORT_DLL)
+#define EXPRT __declspec(dllexport)
+#else
+#define EXPRT
+#endif
+#endif
+
+size_t EXPRT strlcpy(char *dst, const char *src, size_t size);
+size_t EXPRT strlcat(char *dst, const char *src, size_t size);