parsing filename for filetype

floatimg.h

@@ -32,6 +32,10 @@ typedef struct {
 #define FIMG_TYPE_RGB			3
 #define FIMG_TYPE_RGBA			4
 
+#define FILE_TYPE_FIMG			1
+#define FILE_TYPE_PNM			2
+#define FILE_TYPE_PNG			3
+
 /*
  *	core module
  */
@@ -91,6 +95,8 @@ int   fimg_draw_something(FloatImg *fimg);
 
 int parse_WxH(char *str, int *pw, int *ph);
 int parse_double(char *str, double *dptr);
+int format_from_extension(char *fname);
+
 
 
 

funcs/t.c

@@ -9,7 +9,7 @@
 #include "../floatimg.h"
 
 /* --------------------------------------------------------------------- */
-int main(int argc, char *argv[])
+int essai_parse_double(void)
 {
 int		foo;
 double		dval;
@@ -34,3 +34,29 @@ printf("%-10s -> %3d   %g\n", str, foo, dval);
 return 0;
 }
 /* --------------------------------------------------------------------- */
+int essai_detect_type(void)
+{
+int		foo;
+char		*fname;
+
+foo = format_from_extension(fname="foo.fimg");
+printf("%-10s %d\n\n", fname, foo);
+
+foo = format_from_extension(fname="foo.pNm");
+printf("%-10s %d\n\n", fname, foo);
+
+foo = format_from_extension(fname="foo.xyzzy");
+printf("%-10s %d\n\n", fname, foo);
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+int main(int argc, char *argv[])
+{
+int		foo;
+
+foo = essai_detect_type();
+
+return 0;
+}
+/* --------------------------------------------------------------------- */

funcs/utils.c

@@ -1,7 +1,7 @@
 
 
 #include  <stdio.h>
-
+#include  <string.h>
 
 #include  "../floatimg.h"
 
@@ -42,3 +42,24 @@ if (1 == foo) {
 return -1;
 }
 /* --------------------------------------------------------------------- */
+int format_from_extension(char *fname)
+{
+char		*cptr;
+
+cptr = rindex(fname, '.');
+if (NULL==cptr) {
+	fprintf(stderr, "do dot in %s\n", fname);
+	return -1;
+	}
+
+#if DEBUG_LEVEL
+fprintf(stderr, "[%s]  -->  [%s]\n", fname, cptr);
+#endif
+
+if (!strcasecmp(cptr, ".pnm"))	return FILE_TYPE_PNM;
+if (!strcasecmp(cptr, ".fimg"))	return FILE_TYPE_FIMG;
+if (!strcasecmp(cptr, ".png"))	return FILE_TYPE_PNG;
+
+return -1;
+}
+/* --------------------------------------------------------------------- */