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#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
FILE *fOut = NULL;
bool testCpp( const char *prog )
{
FILE *pop = popen("g++ -x c++ - -o /dev/null", "w");
fwrite( prog, 1, strlen( prog ), pop );
return pclose(pop) == 0;
}
void detectEndianness()
{
printf("Detecting endian support...");
fflush( stdout );
if( testCpp("#include <endian.h>\n\nint main() { return BYTE_ORDER; }\n") )
{
fprintf( fOut, "#include <endian.h>\n\n");
printf("header file endian.h found, using that.\n");
}
else
{
uint16_t x=0x0100;
fprintf( fOut,
"#define LITTLE_ENDIAN 0\n"
"#define BIG_ENDIAN 1\n"
"#define BYTE_ORDER %d\n\n",
((uint8_t *)&x)[0]
);
printf("no header file found, faking it...\n"
"\tArchetecture is: %s Endian\n",
((uint8_t *)&x)[0]?"Big":"Little"
);
}
}
int main( int argc, char *argv[] )
{
if( argc == 1 )
{
fprintf( stderr,
"Invalid usage: specify a file to generate:\n"
" src/autoconfig.h\n"
" src/version.h\n"
"\n"
);
return 127;
}
if( strcmp( argv[1], "src/autoconfig.h" ) == 0 )
{
fOut = fopen( argv[1], "w" );
fprintf( fOut,
"#ifndef BU_AUTO_CONFIG_H\n"
"#define BU_AUTO_CONFIG_H\n\n"
);
detectEndianness();
fprintf( fOut, "#endif\n");
}
else if( strcmp( argv[1], "src/version.h" ) == 0 )
{
FILE *fVer = fopen("version", "rt");
char buf[1024];
buf[fread( buf, 1, 1024, fVer )] = '\0';
for( int j = 0; buf[j]; j++ )
if( buf[j] == '\n' )
buf[j] = '\0';
fclose( fVer );
fOut = fopen( argv[1], "w" );
fprintf( fOut,
"#ifndef BU_VERSION_H\n"
"#define BU_VERSION_H\n\n"
"#define LIBBU_VERSION 0\n"
"#define LIBBU_REVISION 1\n"
"#define LIBBU_VERSION_STR \"%s\"\n"
"#define LIBBU_API 0\n"
"#define LIBBU_VC_ID \"",
buf
);
FILE *psub = popen("svnversion -n", "r");
fwrite( buf, fread( buf, 1, 1024, psub ), 1, fOut );
pclose( psub );
fprintf( fOut, "\"\n\n#endif\n");
}
return 0;
}
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