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#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
FILE *fOut = NULL;
bool bHasDevNull;
bool testCpp( const char *prog )
{
FILE *pop = popen(
bHasDevNull?"g++ -x c++ - -o /dev/null":"g++ -x c++ - -o trash.del",
"w");
fwrite( prog, 1, strlen( prog ), pop );
bool bFound = (pclose(pop) == 0);
if( !bHasDevNull )
unlink("trash.del");
return bFound;
}
bool testLib( const char *lib, const char *symname, const char *humname )
{
printf("Detecting library %s (-l%s)...", humname, lib );
fflush( stdout );
static const char *prog = "int main () { return 0; }";
char *cmdline = (char *)malloc( 29+strlen(lib) );
strcpy( cmdline, "g++ -x c++ -l");
strcat( cmdline, lib );
if( bHasDevNull )
strcat( cmdline, " - -o /dev/null");
else
strcat( cmdline, " - -o trash.del");
FILE *pop = popen( cmdline, "w");
fwrite( prog, 1, strlen( prog ), pop );
free( cmdline );
bool bFound = (pclose(pop) == 0);
if( bFound )
{
printf("found.\n");
fprintf( fOut, "#define BU_FEATURE_%s 1\n", symname );
fprintf( fOut, "#define BU_HAS_%s\n", symname );
}
else
{
printf("missing.\n");
fprintf( fOut, "#define BU_FEATURE_%s 0\n", symname );
fprintf( fOut, "#define BU_MISSING_%s\n", symname );
}
if( !bHasDevNull )
unlink("trash.del");
return bFound;
}
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"
);
}
}
bool fileExists( const char *filename )
{
FILE *fTmp = fopen(filename, "rw");
if( fTmp == NULL )
return false;
fclose( fTmp );
return true;
}
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;
}
bHasDevNull = fileExists("/dev/null");
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();
testLib("z", "DEFLATE", "Deflate");
testLib("bz2", "BZIP2", "BZip2");
testLib("lzma", "LZMA", "Lzma");
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 );
char *end;
int32_t iVer = strtol( buf, &end, 10 );
for(; (*end < '1' || *end > '9') && *end; end++ ) { }
int32_t iRev = strtol( end, NULL, 10 );
fOut = fopen( argv[1], "w" );
fprintf( fOut,
"#ifndef BU_VERSION_H\n"
"#define BU_VERSION_H\n\n"
"#define LIBBU_VERSION %d\n"
"#define LIBBU_REVISION %d\n"
"#define LIBBU_VERSION_STR \"%s\"\n"
"#define LIBBU_API 0\n"
"#define LIBBU_VC_ID \"",
iVer, iRev,
buf
);
FILE *psub = popen("git describe --always", "r");
buf[fread( buf, 1, 1024, psub )] = '\0';
for( int j = 0; buf[j]; j++ )
{
if( buf[j] == '\n' )
{
buf[j] = '\0';
}
}
fwrite( buf, strlen(buf), 1, fOut );
pclose( psub );
fprintf( fOut, "\"\n\n#endif\n");
}
return 0;
}
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