Add a coordinate file extractor

2 files changed, 56 insertions, 3 deletions

diff --git a/src/Makefile b/src/Makefile
index 8d1a66d..0ccb1f9 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,7 +1,10 @@
-all: decompress extractblocks
+all: decompress extractblocks mapcoords
 
 decompress: decompress.c mystdlib.c
-        gcc -O2 -o ../bin/decompress decompress.c mystdlib.c -lz
+        $(CC) -O2 -o ../bin/decompress decompress.c mystdlib.c -lz
 
 extractblocks: extractblocks_new.c mystdlib.c
-        gcc -o ../bin/extractblocks extractblocks_new.c mystdlib.c
+        $(CC) -o ../bin/extractblocks extractblocks_new.c mystdlib.c
+
+mapcoords: mapcoords.c mystdlib.c
+        $(CC) -o ../bin/mapcoords mapcoords.c mystdlib.c
diff --git a/src/mapcoords.c b/src/mapcoords.c
new file mode 100644
index 0000000..b7d19f6
--- /dev/null
+++ b/src/mapcoords.c
@@ -0,0 +1,50 @@
+#include "mystdlib.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int find_offset( const void *key, const void *line )
+{
+  size_t l = strlen( *(char**)key );
+  return strncmp( *(char**)key, *(char**)line, l );
+}
+
+int qsort_cmp( const void *a, const void *b )
+{
+  return strcmp( *(char**)a, *(char**)b );
+}
+
+int main( int argc, char ** args )
+{
+  MAP coords = map_file( args[1], 1 );
+  int i, l, lines;
+  char *p, **offsets, *input = malloc(1024);
+  size_t input_length = 1024;
+
+  if( !coords ) exit( 111 );
+  p = (char *)coords->addr;
+  for ( i=0, lines=0; i<coords->size; ++i )
+    if( p[i] == 0x0a )
+    {
+      ++lines;
+      p[i] = 0;
+    }
+
+  offsets = malloc( lines * sizeof(char*));
+  if( !offsets ) exit( 111 );
+
+  offsets[0] = p; l = 1;
+  for ( i=0, lines=0; i<coords->size; ++i )
+    if( !p[i] )
+      offsets[l++] = p+i+1;
+
+  l--; qsort(offsets, l, sizeof(char*), qsort_cmp );
+
+  while( getline( &input, &input_length, stdin ) >= 0 )
+  {
+    char **coord_line = bsearch( input, offsets, l, sizeof(char*), find_offset );
+    printf( "%s\n", *coord_line + strlen( input ) );
+  }
+
+  return 0;
+}