checking export directory, first try

Fonderie/Makefile

@@ -7,12 +7,12 @@ COPT = -g -fpic -no-pie -Wall -DDEBUG_LEVEL=0 -Werror=parentheses
 LIBS = ../libfloatimg.a -ltiff -lpnglite -lm -lz -lcfitsio
 
 OBJS = fifo.o sfx.o crapulator.o glitches.o metriques.o	\
-	filterstack.o single.o
+	filterstack.o single.o utilfuncs.o
 
 DEPS = 	../floatimg.h						\
 	../libfloatimg.a					\
 	fifo.h crapulator.h metriques.h glitches.h sfx.h	\
-	filterstack.h crapdef.h crapstr.h single.h
+	filterstack.h crapdef.h crapstr.h single.h utilfuncs.h
 
 all:	fonderie interpolator singlepass t
 
@@ -71,4 +71,7 @@ metriques.o:	metriques.c metriques.h Makefile
 glitches.o:	glitches.c glitches.h Makefile
 	gcc ${COPT} -c $<
 
+utilfuncs.o:	utilfuncs.c utilfuncs.h Makefile
+	gcc ${COPT} -c $<
+
 # ---------------------------------------------------------

Fonderie/t.c

@@ -16,6 +16,8 @@
 #include  "crapulator.h"
 #include  "single.h"
 
+#include  "utilfuncs.h"
+
 /* ----------------------------------------------------------- */
 
 int		verbosity;
@@ -28,6 +30,30 @@ int		verbosity;
 
 #define		STK	6
 
+/* ----------------------------------------------------------- */
+/* new Sat Nov  9 22:17:46 UTC 2024 */
+int essai_test_export_dir(char *footxt)
+{
+int		foo;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( '%s' )\n", __func__, footxt);
+#endif
+
+foo = check_if_export_dir_is_valid("/tmp/quux", 0);
+fprintf(stderr, "    got %d\n\n", foo);
+
+foo = check_if_export_dir_is_valid("/home", 0);
+fprintf(stderr, "    got %d\n\n", foo);
+
+foo = check_if_export_dir_is_valid("./", 0);
+fprintf(stderr, "    got %d\n\n", foo);
+
+foo = check_if_export_dir_is_valid("Makefile", 0);
+fprintf(stderr, "    got %d\n\n", foo);
+
+return -1;
+}
 /* ----------------------------------------------------------- */
 
 int essai_filterstack(char *fIname, char *fOname)
@@ -36,6 +62,11 @@ int		foo;
 FloatImg	image;
 double		debut, fin;
 
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( '%s' '%s' )\n", __func__, fIname, fOname);
+#endif
+
+
 // filterstack_list(STK, __func__);
 
 foo = fimg_create_from_dump(fIname, &image);
@@ -218,15 +249,23 @@ while ((opt = getopt(argc, argv, "hF:g:i:Lo:O:svx")) != -1) {
 	}
 
 #if DEBUG_LEVEL
-fprintf(stderr, "%s : argc = %d, optind = %d\n", argv[0], argc, optind);
+fprintf(stderr, ">>> %s : argc=%d, optind=%d\n", argv[0], argc, optind);
 #endif
 
+foo = essai_test_export_dir("bla bla");
+if (foo) {
+	fprintf(stderr, "err %d in essai_test_export_dir\n", foo);
+	exit(1);
+	}
+exit(0);
+
 foo = parse_filter_chain(STK, filterchain);
 if (foo) {
 	fprintf(stderr, "err %d in parse_filter_chain\n", foo);
 	exit(1);
 	}
 
+
 if (do_xper) {
 	experiment(infile);
 	return 0;

Fonderie/utilfuncs.c

@@ -0,0 +1,52 @@
+/*
+ *		utilfuncs.c
+ *
+ * new Sat Nov  9 22:15:15 UTC 2024
+ */
+
+#include  <stdio.h>
+#include  <unistd.h>
+#include  <sys/types.h>
+#include  <sys/stat.h>
+
+#include  "utilfuncs.h"
+
+extern int verbosity;
+
+/* -------------------------------------------------------------- */
+int check_if_export_dir_is_valid(char *path, int action)
+{
+int		foo;
+struct stat	statbuf;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( '%s', %d )\n", __func__, path, action);
+#endif
+
+foo = stat(path, &statbuf);
+if (foo) {
+	if (verbosity) perror(path);
+	return 0;
+	}
+
+#if DEBUG_LEVEL
+fprintf(stderr, "    mode 0x%x\n", statbuf.st_mode);
+#endif
+if ((statbuf.st_mode & S_IFMT) != S_IFDIR) {
+	if (verbosity) fprintf(stderr, "%s: Not a directory\n", path);
+	return 0;
+	}
+
+/* OK, c'est un repertoire, mais peut-on écrire dedans ? */
+foo = access(path, W_OK);
+#if DEBUG_LEVEL
+fprintf(stderr, "    access '%s' = %d\n", path, foo);
+#endif
+if (0 != foo) {
+	return 0;
+	}
+
+return 1;		/* export dir is OK */
+}
+/* -------------------------------------------------------------- */
+

Fonderie/utilfuncs.h

@@ -0,0 +1,11 @@
+/*
+ *		utilfuncs.c
+ *
+ * new Sat Nov  9 22:15:49 UTC 2024
+ */
+
+/* -------------------------------------------------------------- */
+
+int check_if_export_dir_is_valid(char *path, int action);
+
+/* -------------------------------------------------------------- */