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diff -up graphviz-2.30.1/cmd/lefty/lefty.c.orig8 graphviz-2.30.1/cmd/lefty/lefty.c
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--- graphviz-2.30.1/cmd/lefty/lefty.c.orig8 2013-02-14 14:27:39.000000000 +0100
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+++ graphviz-2.30.1/cmd/lefty/lefty.c 2013-07-12 12:46:23.730664708 +0200
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@@ -86,6 +86,8 @@ static void processargs (int, char **);
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static void processstr (char *);
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static void printusage (void);
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+static char *cmd;
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+
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#if defined(FEATURE_X11) || defined(FEATURE_NONE)
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int main (int argc, char **argv) {
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@@ -100,6 +102,8 @@ int main (int argc, char **argv) {
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stime = time (NULL);
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#endif
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+ cmd = argv[0];
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+
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idlerunmode = 0;
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exprstr = NULL;
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fp = NULL;
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@@ -393,6 +397,25 @@ static int processinput (int waitflag) {
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return rtn;
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}
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+static char* usestr =
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+" acceptable options are:\n\
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+ -x - exit after processing the input file.\n\
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+ -e E - parse and execute expression E.\n\
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+ -el N - set error reporting level. (0)\n\
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+ -sd N - how much of the stack to show if error is printed. (2)\n\
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+ -sb N - how much of each function in the stack show if error is printed. (2)\n\
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+ -df S - set default font.\n\
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+ -ps F - specify a default file name for postscript files.\n\
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+ -? - show help.\n\
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+ -V - print version.\n";
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+
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+static void usage(char *cmd, int eval)
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+{
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+ fprintf (stderr, "Usage: %s [options] [file]\n", cmd);
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+ fputs (usestr, stderr);
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+ exit (eval);
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+}
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+
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static void processstr (char *buf) {
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char *words[100];
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char *s, *s1;
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@@ -441,11 +466,19 @@ static void processargs (int argc, char
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fprintf (stderr, "lefty version %s\n", LEFTYVERSION);
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fprintf (stderr, "graphviz version %s (%s)\n", VERSION, BUILDDATE);
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}
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+ else if (strcmp (argv[0], "-?") == 0)
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+ usage(cmd, 0);
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else if (strcmp (argv[0], "-") == 0)
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fp = stdin;
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+ else if (argv[0][0] == '-') {
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+ fprintf (stderr, "option %s unrecognized - ignored\n", argv[0]);
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+ usage (cmd, 1);
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+ }
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else {
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- if ((fp = fopen (argv[0], "r")) == NULL)
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- panic1 (POS, "main", "cannot open input file: %s", argv[0]);
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+ if ((fp = fopen (argv[0], "r")) == NULL) {
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+ fprintf (stderr, "cannot open input file: %s", argv[0]);
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+ exit(2);
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+ }
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}
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argv++, argc--;
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}
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diff -up graphviz-2.30.1/cmd/lefty/lefty.1.orig8 graphviz-2.30.1/cmd/lefty/lefty.1
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--- graphviz-2.30.1/cmd/lefty/lefty.1.orig8 2013-02-14 14:27:39.000000000 +0100
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+++ graphviz-2.30.1/cmd/lefty/lefty.1 2013-07-12 12:48:37.829553144 +0200
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@@ -115,6 +115,9 @@ call. The default file name is
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.TP
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.B -V
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Prints the version.
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+.TP
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+.B -?
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+Prints the usage and exits.
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.SH SEE ALSO
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.I lefty
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user guide.
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