Re: #200264 and xmessage

[Hilmar Preusse <hille42@web.de>]

On 26.04.04 Frank Küster (frank@debian.org) wrote:
> Hilmar Preusse <hille42@web.de> schrieb:

Hi all,

> > The source is attached, builds and runs with libxaw6 and libxaw7.
> > Further the patch for debian/rules. 
> 
> Thank you. Wouldn't it be better to give it on argument, and let it
> write 
> 
> "Please install the package\n\"perl-tk\" to use $1."
> 
> so that we can reuse it when there's an other program that depends on
> perl-tk? Or even two arguments, the second being the package name?
> 
I think we don't need 2 arguments. patch attached, to be applied to
my first posted C file. Is now able to display multi line messages.

example usage:
./texdoctk-warn "please install the package\n\"perl-tk\" to use texdoctk"

kudos to Stefan for implementing > 99% of it.

Hilmar 
-- 
Superstition, idolatry, and hypocrisy have ample wages, but truth goes
a-begging.
		-- Martin Luther
  http://hilmarpreusse.forum-rheinland.de/

--- texdoctk-warn.c	Wed Apr 28 10:58:40 2004
+++ texdoctk-warn-new.c	Wed Apr 28 10:56:57 2004
@@ -5,6 +5,8 @@
    gcc -o texdoctk-warn -O2 -W -Wall -ansi -pedantic -L/usr/X11R6/lib -lXaw -lXt -lX11 texdoctk-warn.c
 */
 #include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
 
 #include <X11/Xlib.h>
 #include <X11/StringDefs.h>
@@ -26,14 +28,50 @@
     exit(0);
 }
 
+static char *
+normalize_newline(char *str)
+{
+    int i, k;
+    for (i = 0, k = 0; str[i] != '\0'; i++, k++) {
+	if (str[i] == '\\' && str[i + 1] == 'n') {
+	    /* escaped `\n': change `\\n' to `\n' */
+	    if (i > 1 && str[i - 1] == '\\') {
+		str[k] = str[i + 1];
+	    }
+	    else {
+		str[k] = '\n';
+	    }
+	    i++;
+	}
+	else {
+	    str[k] = str[i];
+	}
+    }
+    str[k] = '\0';
+    return str;
+}
+
 int main(int argc, char *argv[])
 {
     XtAppContext app_context;
     Widget toplevel, paned, text, box, button;
     int offset = 6;
     XtAccelerators accels;
-    /* test for multi-lines */
-    const char *msg = "Please install the package\n\"perl-tk\" to use texdoctk.";
+    char *msg = NULL;
+
+    if (argc < 2) {
+	fprintf(stderr, "Usage: %s message\n", argv[0]);
+	exit(1);
+    }
+    if ((msg = malloc(strlen(argv[1]) + 1)) == NULL) {
+	fprintf(stderr, "Couldn't allocate space for `%s'!\n", argv[1]);
+	exit(1);
+    }
+
+    strcpy(msg, argv[1]);
+
+    /* replace "\n" in msg (2 chars) by `\n' (one char) */
+    msg = normalize_newline(msg);
 
     toplevel = XtAppInitialize(&app_context, "Info",
 			       NULL, 0,