error limit

[vg.git] / vg_platform.h

diff --git a/vg_platform.h b/vg_platform.h
index 210192d60e7164fbf6e15ed72940bb74da6b62c6..b04ce672b9afa8d0803dec16dffb7f5bcbc48c77 100644 (file)
--- a/vg_platform.h
+++ b/vg_platform.h
@@ -39,17 +39,6 @@ struct vg_achievement
 #define vg_list_size( A ) (sizeof(A)/sizeof(A[0]))
 #define VG_MUST_USE_RESULT __attribute__((warn_unused_result))
 
-VG_STATIC void vg_strncpy( const char *src, char *dst, u32 len )
-{
-   for( u32 i=0; i<len; i++ )
-   {
-      dst[i] = src[i];
-
-      if( !src[i] )
-         break;
-   }
-}
-
 #include <stdio.h>
 #include <dirent.h>
 #include <string.h>
@@ -58,6 +47,88 @@ VG_STATIC void vg_strncpy( const char *src, char *dst, u32 len )
 #include <math.h>
 #include <assert.h>
 
+enum strncpy_behaviour{
+   k_strncpy_always_add_null = 0,
+   k_strncpy_allow_cutoff = 1,
+   k_strncpy_overflow_fatal = 2
+};
+
+VG_STATIC void vg_fatal_error( const char *fmt, ... );
+VG_STATIC u32 vg_strncpy( const char *src, char *dst, u32 len,
+                          enum strncpy_behaviour behaviour )
+{
+   for( u32 i=0; i<len; i++ ){
+      dst[i] = src[i];
+
+      if( !src[i] ) return i;
+
+      if( i == len-1 ){
+         if( behaviour == k_strncpy_always_add_null ){
+            dst[i] = '\0';
+            return i;
+         }
+         else if( behaviour == k_strncpy_overflow_fatal ){
+            vg_fatal_error( "Strncpy dest exceeded buffer length\n" );
+         }
+      }
+   }
+
+   return 0;
+}
+
+typedef struct vg_str vg_str;
+struct vg_str{
+   char *buffer;
+   u32 i, len;
+};
+
+VG_STATIC void vg_strnull( vg_str *str, char *buffer, u32 len )
+{
+   str->buffer = buffer;
+   str->buffer[0] = '\0';
+   str->i = 0;
+   str->len = len;
+}
+
+VG_STATIC void vg_strcat( vg_str *str, const char *append )
+{
+   for( u32 i=0; str->i < str->len; i++, str->i ++ ){
+      str->buffer[ str->i ] = append[i];
+
+      if( append[i] == '\0' ) return;
+   }
+}
+
+VG_STATIC int vg_strgood( vg_str *str )
+{
+   if( str->i == str->len ){
+      if( str->buffer[str->i -1] == '\0' ) return 1;
+      else return 0;
+   }
+   else return 1;
+}
+
+VG_STATIC char *vg_strch( vg_str *str, char c )
+{
+   char *ptr = NULL;
+   for( u32 i=0; i<str->i; i++ ){
+      if( str->buffer[i] == c )
+         ptr = str->buffer+i;
+   }
+
+   return ptr;
+}
+
+VG_STATIC u32 vg_strdjb2( const char *str )
+{
+   u32 hash = 5381, c;
+
+   while( (c = *str++) )
+      hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
+
+   return hash;
+}
+
 #define VG_MIN( A, B ) ((A)<(B)?(A):(B))
 #define VG_MAX( A, B ) ((A)>(B)?(A):(B))
 #endif