eeshow/: use dedicated functions for diagnostics, instead of fprintf and exit

eeshow/diag.c

@@ -22,6 +22,38 @@
 unsigned verbose = 0;
 
 
+void fatal(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	exit(1); /* @@@ for now ... */
+}
+
+
+void error(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+}
+
+
+void warning(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	fprintf(stderr, "warning: ");
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+}
+
+
 void progress(unsigned level, const char *fmt, ...)
 {
 	va_list ap;

eeshow/diag.h

@@ -23,6 +23,28 @@
 extern unsigned verbose;
 
 
+/*
+ * Terminate immediately. Further execution makes no sense.
+ * E.g., out of memory.
+ */
+
+void __attribute__((noreturn)) fatal(const char *fmt, ...);
+
+/*
+ * Operation has failed, but the program as a whole may still be able to
+ * continue. E.g., a schematics component was not found.
+ */
+
+void error(const char *fmt, ...);
+
+/*
+ * A minor operation has failed or some other issue was detected. This may
+ * be (or lead to) a more serious problem, but does not immediately affect
+ * operation.
+ */
+
+void warning(const char *fmt, ...);
+
 /*
  * Progress message, used mainly for debugging. "level" is the minimum
  * verbosity level required.

eeshow/diff.c

@@ -20,6 +20,7 @@
 #include <cairo/cairo.h>
 
 #include "util.h"
+#include "diag.h"
 #include "main.h"
 #include "cro.h"
 #include "file.h"
@@ -280,11 +281,8 @@ static void diff_end(void *ctx)
 	int w, h, stride;
 
 	old_img = cro_img_end(diff->cr_ctx, &w, &h, &stride);
-	if (diff->w != w || diff->h != h) {
-		fprintf(stderr, "%d x %d vs. %d x %d image\n",
-		    w, h, diff->w, diff->h);
-		exit(1);
-	}
+	if (diff->w != w || diff->h != h)
+		fatal("%d x %d vs. %d x %d image\n", w, h, diff->w, diff->h);
 
 	differences(diff, old_img, diff->new_img);
 	show_areas(diff, old_img);

eeshow/file.c

@@ -194,7 +194,7 @@ bool file_open(struct file *file, const char *name, const struct file *related)
 	if (file->vcs)
 		return 1;
 
-	fprintf(stderr, "could not open %s\n", name);
+	error("could not open %s\n", name);
 fail:
 	free((char *) file->name);
 	return 0;

eeshow/fmt-pango.c

@@ -19,6 +19,7 @@
 #include <alloca.h>
 
 #include "util.h"
+#include "diag.h"
 #include "fmt-pango.h"
 
 
@@ -107,8 +108,7 @@ unsigned vsfmt_pango(char *buf, const char *fmt, va_list ap)
 			res++;
 			break;
 		default:
-			fprintf(stderr, "unrecognized format '%%%c'\n", *q);
-			exit(1);
+			fatal("unrecognized format '%%%c'\n", *q);
 		}
 		p = q;
 	}

eeshow/git-file.c

@@ -99,22 +99,17 @@ static git_tree *pick_revision(git_repository *repo, const char *revision)
 	if (git_revparse_single(&obj, repo, revision)) {
 		const git_error *e = giterr_last();
 
-		fprintf(stderr, "%s: %s\n",
-		    git_repository_path(repo), e->message);
-		exit(1);
+		fatal("%s: %s\n", git_repository_path(repo), e->message);
 	}
 
-	if (git_object_type(obj) != GIT_OBJ_COMMIT) {
-		fprintf(stderr, "%s: not a commit\n", revision);
-		exit(1);
-	}
+	if (git_object_type(obj) != GIT_OBJ_COMMIT)
+		fatal("%s: not a commit\n", revision);
 	commit = (git_commit *) obj;
 
 	if (git_commit_tree(&tree, commit)) {
 		const git_error *e = giterr_last();
 
-		fprintf(stderr, "%s: %s\n", revision, e->message);
-		exit(1);
+		fatal("%s: %s\n", revision, e->message);
 	}
 
 	return tree;
@@ -134,10 +129,8 @@ static char *canonical_path_into_repo(const char *repo_dir, const char *path)
 		perror(repo_dir);
 		exit(1);
 	}
-	if (!S_ISDIR(repo_st.st_mode)) {
-		fprintf(stderr, "%s: not a directory\n", repo_dir);
-		exit(1);
-	}
+	if (!S_ISDIR(repo_st.st_mode))
+		fatal("%s: not a directory\n", repo_dir);
 
 	/* convert relative paths to absolute */
 
@@ -167,10 +160,8 @@ static char *canonical_path_into_repo(const char *repo_dir, const char *path)
 		progress(3, "probing \"%s\" tail \"%s\"\n", tmp, tail);
 		if (stat(tmp, &path_st) == 0)
 			break;
-		if (!tmp[1]) {
-			fprintf(stderr, "%s: cannot resolve\n", path);
-			exit(1);
-		}
+		if (!tmp[1])
+			fatal("%s: cannot resolve\n", path);
 		slash = strrchr(tmp, '/');
 		if (tail != end)
 			tail[-1] = '/';
@@ -198,15 +189,13 @@ static char *canonical_path_into_repo(const char *repo_dir, const char *path)
 			if (!*from)
 				break;
 		}
-		if (to == tail) {
-			/*
-			 * We have something like this:
-			 * /home/repo/dead/../../foo
-			 */
-			fprintf(stderr, "%s: can't climb out of dead path\n",
-			    path);
-			exit(1);
-		}
+
+		/*
+		 * We have something like this:
+		 * /home/repo/dead/../../foo
+		 */
+		if (to == tail)
+			fatal("%s: can't climb out of dead path\n", path);
 
 		/*
 		 * We have something like
@@ -255,12 +244,9 @@ static char *canonical_path_into_repo(const char *repo_dir, const char *path)
 		slash = strrchr(tmp, '/');
 
 		/* "this cannot happen" */
-		if (tail == tmp || !slash) {
-			fprintf(stderr,
-			    "divergent paths:\nrepo \"%s\"\nobject \"%s\"\n",
+		if (tail == tmp || !slash)
+			fatal("divergent paths:\nrepo \"%s\"\nobject \"%s\"\n",
 			    repo_dir, tail);
-			exit(1);
-		}
 
 		if (tail != end)
 			tail[-1] = '/';
@@ -301,7 +287,7 @@ static git_tree_entry *find_file(git_repository *repo, git_tree *tree,
 	if (git_tree_entry_bypath(&entry, tree, canon_path)) {
 		const git_error *e = giterr_last();
 
-		fprintf(stderr, "%s: %s\n", path, e->message);
+		error("%s: %s\n", path, e->message);
 		free(canon_path);
 		return NULL;
 	}
@@ -318,15 +304,12 @@ static const void *get_data(struct vcs_git *vcs_git, git_tree_entry *entry,
 	git_object *obj;
 	git_blob *blob;
 
-	if (git_tree_entry_type(entry) != GIT_OBJ_BLOB) {
-		fprintf(stderr, "entry is not a blob\n");
-		exit(1);
-	}
+	if (git_tree_entry_type(entry) != GIT_OBJ_BLOB)
+		fatal("entry is not a blob\n");
 	if (git_tree_entry_to_object(&obj, repo, entry)) {
 		const git_error *e = giterr_last();
 
-		fprintf(stderr, "%s\n", e->message);
-		exit(1);
+		fatal("%s\n", e->message);
 	}
 	vcs_git->obj = obj;
 
@@ -336,8 +319,7 @@ static const void *get_data(struct vcs_git *vcs_git, git_tree_entry *entry,
 		if (git_object_short_id(&buf, obj))  {
 			const git_error *e = giterr_last();
 
-			fprintf(stderr, "%s\n", e->message);
-			exit(1);
+			fatal("%s\n", e->message);
 		}
 		progress(3, "object %s\n", buf.ptr);
 		git_buf_free(&buf);
@@ -394,8 +376,7 @@ static bool related_other_repo(struct vcs_git *vcs_git)
 
 	/* @@@ find revision <= date of revision in related */
 	if (!shown)
-		fprintf(stderr,
-		    "warning: related_other_repo is not yet implemented\n");
+		warning("related_other_repo is not yet implemented\n");
 	shown = 1;
 	return 0;
 }
@@ -463,7 +444,7 @@ struct vcs_git *vcs_git_open(const char *revision, const char *name,
 
 	vcs_git->repo = select_repo(name);
 	if (!vcs_git->repo) {
-		fprintf(stderr, "%s: not found\n", name);
+		error("%s: not found\n", name);
 		goto fail;
 	}
 	progress(2, "using repository %s\n",

eeshow/git-hist.c

@@ -88,8 +88,7 @@ static void recurse(struct hist *h,
 
 	n = git_commit_parentcount(h->commit);
 	if (verbose > 2)
-		fprintf(stderr, "commit %p: %u + %u\n",
-		    h->commit, n_branches, n);
+		progress(3, "commit %p: %u + %u\n", h->commit, n_branches, n);
 
 	b = alloca(sizeof(struct hist) * (n_branches - 1 + n));
 	n_branches--;
@@ -104,8 +103,7 @@ static void recurse(struct hist *h,
 
 		if (git_commit_parent(&commit, h->commit, i)) {
 			e = giterr_last();
-			fprintf(stderr, "git_commit_parent: %s\n", e->message);
-			exit(1);
+			fatal("git_commit_parent: %s\n", e->message);
 		}
 		for (j = 0; j != n_branches; j++) {
 			found = find_commit(b[j], commit);
@@ -156,22 +154,17 @@ struct hist *vcs_git_hist(const char *path)
 	if (git_repository_open_ext(&repo, path,
 	    GIT_REPOSITORY_OPEN_CROSS_FS, NULL)) {
 		e = giterr_last();
-		fprintf(stderr, "%s: %s\n", path, e->message);
-		exit(1);
+		fatal("%s: %s\n", path, e->message);
 	}
 
 	if (git_reference_name_to_id(&oid, repo, "HEAD")) {
 		e = giterr_last();
-		fprintf(stderr, "%s: %s\n",
-		    git_repository_path(repo), e->message);
-		exit(1);
+		fatal("%s: %s\n", git_repository_path(repo), e->message);
 	}
 
 	if (git_commit_lookup(&head->commit, repo, &oid)) {
 		e = giterr_last();
-		fprintf(stderr, "%s: %s\n",
-		    git_repository_path(repo), e->message);
-		exit(1);
+		fatal("%s: %s\n", git_repository_path(repo), e->message);
 	}
 
 	recurse(head, 1, &head);
@@ -210,8 +203,7 @@ const char *vcs_git_summary(struct hist *h)
 		return summary;
 
 	e = giterr_last();
-	fprintf(stderr, "git_commit_summary: %s\n", e->message);
-	exit(1);
+	fatal("git_commit_summary: %s\n", e->message);
 }
 
 
@@ -243,8 +235,7 @@ char *vcs_git_long_for_pango(struct hist *h)
 
 fail:
 	e = giterr_last();
-	fprintf(stderr, "vcs_git_long_for_pango: %s\n", e->message);
-	exit(1);
+	fatal("vcs_git_long_for_pango: %s\n", e->message);
 }
 
 
@@ -269,9 +260,7 @@ void dump_hist(struct hist *h)
 	if (h->commit) {
 		if (git_object_short_id(&buf, (git_object *) h->commit)) {
 			e = giterr_last();
-			fprintf(stderr, "git_object_short_id: %s\n",
-			    e->message);
-			exit(1);
+			fatal("git_object_short_id: %s\n", e->message);
 		}
 		printf("%*s%s  %s\n",
 		    2 * h->branch, "", buf.ptr, vcs_git_summary(h));

eeshow/gui.c

@@ -29,6 +29,7 @@
 #include <gtk/gtk.h>
 
 #include "util.h"
+#include "diag.h"
 #include "style.h"
 #include "cro.h"
 #include "gfx.h"
@@ -1294,10 +1295,8 @@ int gui(unsigned n_args, char **args, bool recurse, int limit)
 	get_revisions(&ctx, n_args, args, recurse, limit);
 	for (ctx.new_hist = ctx.hist; ctx.new_hist && !ctx.new_hist->sheets;
 	    ctx.new_hist = ctx.new_hist->next);
-	if (!ctx.new_hist) {
-		fprintf(stderr, "no valid sheets\n");
-		return 1;
-	}
+	if (!ctx.new_hist)
+		fatal("no valid sheets\n");
 
 	window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 

eeshow/lib-parse.c

@@ -16,6 +16,7 @@
 #include <assert.h>
 
 #include "util.h"
+#include "diag.h"
 #include "text.h"
 #include "file.h"
 #include "lib.h"
@@ -250,11 +251,9 @@ static bool lib_parse_line(const struct file *file,
 		 * zero2 seems to be the font style: 0 = normal, 1 = bold ?
 		 */
 		if (n == 12) {
-			if (zero1) {
-				fprintf(stderr, "%u: only understand 0 x x\n"
+			if (zero1)
+				fatal("%u: only understand 0 x x\n"
 				    "\"%s\"\n", file->lineno, line);
-				exit(1);
-			}
 			obj->u.text.style = decode_style(style);
 			obj->type = lib_obj_text;
 			return 1;
@@ -272,8 +271,7 @@ static bool lib_parse_line(const struct file *file,
 	default:
 		abort();
 	}
-	fprintf(stderr, "%u: cannot parse\n\"%s\"\n", file->lineno, line);
-	exit(1);
+	fatal("%u: cannot parse\n\"%s\"\n", file->lineno, line);
 }
 
 

eeshow/lib-render.c

@@ -16,6 +16,7 @@
 #include <assert.h>
 
 #include "util.h"
+#include "diag.h"
 #include "misc.h"
 #include "style.h"
 #include "gfx.h"
@@ -379,8 +380,7 @@ const struct comp *lib_find(const struct lib *lib, const char *name)
 			if (!strcmp(alias->name, name))
 				return comp;
 	}
-	fprintf(stderr, "\"%s\" not found\n", name);
-	exit(1);
+	fatal("\"%s\" not found\n", name);
 }
 
 

eeshow/main.c

@@ -204,9 +204,7 @@ int main(int argc, char **argv)
 		for (ops = ops_list; ops != ARRAY_END(ops_list); ops++)
 			if (!strcmp((*ops)->name, *gfx_argv))
 				goto found;
-		fprintf(stderr, "graphics backend \"%s\" not found\n",
-		    *gfx_argv);
-		exit(1);
+		fatal("graphics backend \"%s\" not found\n", *gfx_argv);
 found:
 		;
 	}
@@ -221,11 +219,8 @@ found:
 	if (recurse) {
 		const struct sheet *sheet;
 
-		if (!gfx_multi_sheet()) {
-			fprintf(stderr,
-			    "graphics backend only supports single sheet\n");
-			exit(1);
-		}
+		if (!gfx_multi_sheet())
+			fatal("graphics backend only supports single sheet\n");
 		for (sheet = sch_ctx.sheets; sheet; sheet = sheet->next) {
 			sch_render(sheet);
 			if (sheet->next)

eeshow/misc.c

@@ -16,6 +16,7 @@
 #include <stdio.h>
 #include <assert.h>
 
+#include "diag.h"
 #include "misc.h"
 
 
@@ -45,9 +46,7 @@ unsigned matrix_to_angle(const int m[6])
 	if (eq(m, 0, -1, 1, 0))	/* x-flipped, 270 deg */
 		return 270;
 
-	fprintf(stderr, "unrecognized matrix %d %d %d %d\n",
-	    m[1], m[2], m[4], m[5]);
-	exit(1);
+	fatal("unrecognized matrix %d %d %d %d\n", m[1], m[2], m[4], m[5]);
 }
 
 

eeshow/sch-parse.c

@@ -20,6 +20,7 @@
 #include <assert.h>
 
 #include "util.h"
+#include "diag.h"
 #include "dwg.h"
 #include "file.h"
 #include "lib.h"
@@ -41,8 +42,7 @@ static enum dwg_shape do_decode_shape(const char *s)
 		return dwg_tri;
 	if (!strcmp(s, "BiDi"))
 		return dwg_bidir;
-	fprintf(stderr, "unknown shape: \"%s\"\n", s);
-	exit(1);
+	fatal("unknown shape: \"%s\"\n", s);
 }
 
 
@@ -176,8 +176,7 @@ static enum dwg_shape decode_form(char form)
 	case 'U':
 		return dwg_unspec;
 	default:
-		fprintf(stderr, "unknown form: \"%c\"\n", form);
-		exit(1);
+		fatal("unknown form: \"%c\"\n", form);
 	}
 }
 
@@ -194,8 +193,7 @@ static int decode_side(char side)
 	case 'T':
 		return 3;	/* down */
 	default:
-		fprintf(stderr, "unknown side: \"%c\"\n", side);
-		exit(1);
+		fatal("unknown side: \"%c\"\n", side);
 	}
 }
 
@@ -569,9 +567,7 @@ static bool parse_line(const struct file *file, void *user, const char *line)
 	default:
 		abort();
 	}
-	fprintf(stderr, "%s:%u: cannot parse\n\"%s\"\n",
-	    file->name, file->lineno, line);
-	exit(1);
+	fatal("%s:%u: cannot parse\n\"%s\"\n", file->name, file->lineno, line);
 }