vg_platform.h

   1 #ifndef VG_PLATFORM_H
   2 #define VG_PLATFORM_H
   3
   4 #ifdef VG_RELEASE
   5  #define VG_STATIC static
   6 #else
   7  #define VG_STATIC
   8 #endif
   9
  10 //#include "vg.h"
  11 #include "vg_stdint.h"
  12
  13 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
  14
  15 typedef unsigned int uint;
  16
  17 typedef int             v2i[2];
  18 typedef int             v3i[3];
  19 typedef int             v4i[4];
  20 typedef float           v2f[2];
  21 typedef float           v3f[3];
  22 typedef float           v4f[4];
  23 typedef v2f                     m2x2f[2];
  24 typedef v3f                     m3x3f[3];
  25 typedef v3f                     m4x3f[4];
  26 typedef v4f       m4x4f[4];
  27 typedef v3f                     boxf[2];
  28
  29 // Resource types
  30 typedef struct vg_tex2d vg_tex2d;
  31
  32 struct vg_achievement
  33 {
  34         int is_set;
  35         const char *name;
  36 };
  37
  38 #define vg_static_assert _Static_assert
  39 #define vg_list_size( A ) (sizeof(A)/sizeof(A[0]))
  40 #define VG_MUST_USE_RESULT __attribute__((warn_unused_result))
  41
  42 #include <stdio.h>
  43 #include <string.h>
  44 #include <stdarg.h>
  45 #include <ctype.h>
  46 #include <math.h>
  47 #include <assert.h>
  48 #include <setjmp.h>
  49 #include <sys/time.h>
  50 #include <math.h>
  51 #include <stdio.h>
  52 #include <errno.h>
  53
  54 enum strncpy_behaviour{
  55    k_strncpy_always_add_null = 0,
  56    k_strncpy_allow_cutoff = 1,
  57    k_strncpy_overflow_fatal = 2
  58 };
  59
  60 VG_STATIC void vg_fatal_error( const char *fmt, ... );
  61 VG_STATIC u32 vg_strncpy( const char *src, char *dst, u32 len,
  62                           enum strncpy_behaviour behaviour )
  63 {
  64    for( u32 i=0; i<len; i++ ){
  65       dst[i] = src[i];
  66
  67       if( !src[i] ) return i;
  68
  69       if( i == len-1 ){
  70          if( behaviour == k_strncpy_always_add_null ){
  71             dst[i] = '\0';
  72             return i;
  73          }
  74          else if( behaviour == k_strncpy_overflow_fatal ){
  75             vg_fatal_error( "Strncpy dest exceeded buffer length\n" );
  76          }
  77       }
  78    }
  79
  80    return 0;
  81 }
  82
  83 typedef struct vg_str vg_str;
  84 struct vg_str{
  85    char *buffer;
  86    u32 i, len;
  87 };
  88
  89 VG_STATIC void vg_strnull( vg_str *str, char *buffer, u32 len )
  90 {
  91    str->buffer = buffer;
  92    str->buffer[0] = '\0';
  93    str->i = 0;
  94    str->len = len;
  95 }
  96
  97 VG_STATIC void vg_strcat( vg_str *str, const char *append )
  98 {
  99    for( u32 i=0; str->i < str->len; i++, str->i ++ ){
 100       str->buffer[ str->i ] = append[i];
 101
 102       if( append[i] == '\0' ) return;
 103    }
 104 }
 105
 106 VG_STATIC int vg_strgood( vg_str *str )
 107 {
 108    if( str->i == str->len ){
 109       if( str->buffer[str->i -1] == '\0' ) return 1;
 110       else return 0;
 111    }
 112    else return 1;
 113 }
 114
 115 VG_STATIC char *vg_strch( vg_str *str, char c )
 116 {
 117    char *ptr = NULL;
 118    for( u32 i=0; i<str->i; i++ ){
 119       if( str->buffer[i] == c )
 120          ptr = str->buffer+i;
 121    }
 122
 123    return ptr;
 124 }
 125
 126 VG_STATIC u32 vg_strdjb2( const char *str )
 127 {
 128    u32 hash = 5381, c;
 129
 130    while( (c = *str++) )
 131       hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
 132
 133    return hash;
 134 }
 135
 136 VG_STATIC int vg_strdjb2_eq( const char *s1, u32 h1,
 137                              const char *s2, u32 h2 )
 138 {
 139    if( h1 == h2 ){
 140       if(!strcmp(s1, s2)) return 1;
 141       else return 0;
 142    } else return 0;
 143 }
 144
 145 #define VG_STRDJB2_EQ( CS1, S2, H2 ) \
 146    vg_strdjb2_eq( CS1, vg_strdjb2(CS1), S2, H2 )
 147
 148
 149 #define VG_MIN( A, B ) ((A)<(B)?(A):(B))
 150 #define VG_MAX( A, B ) ((A)>(B)?(A):(B))
 151 #endif