From d573625b41141d7946a72327982171001140ef6f Mon Sep 17 00:00:00 2001
From: hgn <hgodden00@gmail.com>
Date: Sun, 8 Oct 2023 11:41:02 +0100
Subject: [PATCH] improved vg_str functions

---
 vg_platform.h | 57 +++++++++++++++++++++++++++++++++++----------------
 1 file changed, 39 insertions(+), 18 deletions(-)

diff --git a/vg_platform.h b/vg_platform.h
index 30751f2..b22f989 100644
--- a/vg_platform.h
+++ b/vg_platform.h
@@ -77,40 +77,62 @@ static u32 vg_strncpy( const char *src, char *dst, u32 len,
 typedef struct vg_str vg_str;
 struct vg_str{
    char *buffer;
-   u32 i, len;
+   i32 i, len;
 };
 
-static void vg_strnull( vg_str *str, char *buffer, u32 len )
-{
+static void vg_strnull( vg_str *str, char *buffer, i32 len ){
    str->buffer = buffer;
    str->buffer[0] = '\0';
    str->i = 0;
    str->len = len;
+
+   assert(len);
 }
 
-static void vg_strcat( vg_str *str, const char *append )
-{
+static void vg_strcat( vg_str *str, const char *append ){
    if( !append ) return;
-   for( u32 i=0; str->i < str->len; i++, str->i ++ ){
-      str->buffer[ str->i ] = append[i];
+   if( str->i == -1 ) return;
+
+   for( u32 i=0; str->i < str->len; str->i ++, i ++ ){
+      str->buffer[ str->i ] = append[ i ];
 
-      if( append[i] == '\0' ) return;
+      if( append[ i ] == '\0' )
+         return;
    }
+
+   /* overflow */
+   str->buffer[ str->i ] = '\0';
+   str->i = -1;
 }
 
-static int vg_strgood( vg_str *str )
-{
-   if( str->i == str->len ){
-      if( str->buffer[str->i -1] == '\0' ) return 1;
-      else return 0;
+static void vg_strcati32( vg_str *str, i32 value ){
+   if( value ){
+      char temp[32];
+      int i=0;
+      while( value && (i<31) ){
+         temp[ i ++ ] = '0' + (value % 10);
+         value /= 10;
+      }
+
+      char reverse[32];
+      for( int j=0; j<i; j ++ )
+         reverse[j] = temp[ i-1-j ];
+      reverse[i] = '\0';
+
+      vg_strcat( str, reverse );
    }
+   else
+      vg_strcat( str, "0" );
+}
+
+static int vg_strgood( vg_str *str ){
+   if( str->i == -1 ) return 0;
    else return 1;
 }
 
-static char *vg_strch( vg_str *str, char c )
-{
+static char *vg_strch( vg_str *str, char c ){
    char *ptr = NULL;
-   for( u32 i=0; i<str->i; i++ ){
+   for( i32 i=0; i<str->i; i++ ){
       if( str->buffer[i] == c )
          ptr = str->buffer+i;
    }
@@ -118,8 +140,7 @@ static char *vg_strch( vg_str *str, char c )
    return ptr;
 }
 
-static u32 vg_strdjb2( const char *str )
-{
+static u32 vg_strdjb2( const char *str ){
    u32 hash = 5381, c;
 
    while( (c = *str++) )
-- 
2.25.1