vg_platform.h

   1 #ifndef VG_PLATFORM_H
   2 #define VG_PLATFORM_H
   3
   4 //#include "vg.h"
   5 #include "vg_stdint.h"
   6
   7 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
   8
   9 typedef unsigned int uint;
  10
  11 typedef int             v2i[2];
  12 typedef int             v3i[3];
  13 typedef int             v4i[4];
  14 typedef float           v2f[2];
  15 typedef float           v3f[3];
  16 typedef float           v4f[4];
  17 typedef v2f                     m2x2f[2];
  18 typedef v3f                     m3x3f[3];
  19 typedef v3f                     m4x3f[4];
  20 typedef v4f       m4x4f[4];
  21 typedef v3f                     boxf[2];
  22
  23 // Resource types
  24 typedef struct vg_tex2d vg_tex2d;
  25
  26 struct vg_achievement
  27 {
  28         int is_set;
  29         const char *name;
  30 };
  31
  32 #define vg_static_assert _Static_assert
  33 #define vg_list_size( A ) (sizeof(A)/sizeof(A[0]))
  34 #define VG_MUST_USE_RESULT __attribute__((warn_unused_result))
  35
  36 #include <stdio.h>
  37 #include <string.h>
  38 #include <stdarg.h>
  39 #include <ctype.h>
  40 #include <math.h>
  41 #include <assert.h>
  42 #include <setjmp.h>
  43 #include <sys/time.h>
  44 #include <math.h>
  45 #include <stdio.h>
  46 #include <errno.h>
  47
  48 enum strncpy_behaviour{
  49    k_strncpy_always_add_null = 0,
  50    k_strncpy_allow_cutoff = 1,
  51    k_strncpy_overflow_fatal = 2
  52 };
  53
  54 static void vg_fatal_error( const char *fmt, ... );
  55 static u32 vg_strncpy( const char *src, char *dst, u32 len,
  56                           enum strncpy_behaviour behaviour )
  57 {
  58    for( u32 i=0; i<len; i++ ){
  59       dst[i] = src[i];
  60
  61       if( !src[i] ) return i;
  62
  63       if( i == len-1 ){
  64          if( behaviour == k_strncpy_always_add_null ){
  65             dst[i] = '\0';
  66             return i;
  67          }
  68          else if( behaviour == k_strncpy_overflow_fatal ){
  69             vg_fatal_error( "Strncpy dest exceeded buffer length\n" );
  70          }
  71       }
  72    }
  73
  74    return 0;
  75 }
  76
  77 typedef struct vg_str vg_str;
  78 struct vg_str{
  79    char *buffer;
  80    i32 i, len;
  81 };
  82
  83 static void vg_strnull( vg_str *str, char *buffer, i32 len ){
  84    str->buffer = buffer;
  85    str->buffer[0] = '\0';
  86    str->i = 0;
  87    str->len = len;
  88
  89    assert(len);
  90 }
  91
  92 static void vg_strcat( vg_str *str, const char *append ){
  93    if( !append ) return;
  94    if( str->i == -1 ) return;
  95
  96    for( u32 i=0; str->i < str->len; str->i ++, i ++ ){
  97       str->buffer[ str->i ] = append[ i ];
  98
  99       if( append[ i ] == '\0' )
 100          return;
 101    }
 102
 103    /* overflow */
 104    str->buffer[ str->i ] = '\0';
 105    str->i = -1;
 106 }
 107
 108 static void vg_strcati32( vg_str *str, i32 value ){
 109    if( value ){
 110       char temp[32];
 111       int i=0;
 112       while( value && (i<31) ){
 113          temp[ i ++ ] = '0' + (value % 10);
 114          value /= 10;
 115       }
 116
 117       char reverse[32];
 118       for( int j=0; j<i; j ++ )
 119          reverse[j] = temp[ i-1-j ];
 120       reverse[i] = '\0';
 121
 122       vg_strcat( str, reverse );
 123    }
 124    else
 125       vg_strcat( str, "0" );
 126 }
 127
 128 static int vg_strgood( vg_str *str ){
 129    if( str->i == -1 ) return 0;
 130    else return 1;
 131 }
 132
 133 static char *vg_strch( vg_str *str, char c ){
 134    char *ptr = NULL;
 135    for( i32 i=0; i<str->i; i++ ){
 136       if( str->buffer[i] == c )
 137          ptr = str->buffer+i;
 138    }
 139
 140    return ptr;
 141 }
 142
 143 static u32 vg_strdjb2( const char *str ){
 144    u32 hash = 5381, c;
 145
 146    while( (c = *str++) )
 147       hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
 148
 149    return hash;
 150 }
 151
 152 static int vg_strdjb2_eq( const char *s1, u32 h1,
 153                              const char *s2, u32 h2 )
 154 {
 155    if( h1 == h2 ){
 156       if(!strcmp(s1, s2)) return 1;
 157       else return 0;
 158    } else return 0;
 159 }
 160
 161 #define VG_STRDJB2_EQ( CS1, S2, H2 ) \
 162    vg_strdjb2_eq( CS1, vg_strdjb2(CS1), S2, H2 )
 163
 164
 165 #define VG_MIN( A, B ) ((A)<(B)?(A):(B))
 166 #define VG_MAX( A, B ) ((A)>(B)?(A):(B))
 167 #endif