Add an error check for correct formatting in Deflate uncompressed

[sgt/halibut] / help.c

diff --git a/help.c b/help.c
index 7235032..d65645d 100644 (file)
--- a/help.c
+++ b/help.c
@@ -5,7 +5,7 @@
 #include <stdio.h>
 #include "halibut.h"
 
-static char *helptext[] = {
+static const char *const helptext[] = {
     "usage:   halibut [options] files",
     "options: --text[=filename]     generate plain text output",
     "         --html[=filename]     generate XHTML output",
@@ -16,6 +16,8 @@ static char *helptext[] = {
     "         --pdf[=filename]      generate PDF output",
     "         -Cfoo:bar:baz         append \\cfg{foo}{bar}{baz} to input",
     "         --input-charset=cs    change default input file charset",
+    "         --list-charsets       display supported character set names",
+    "         --list-fonts          display supported font names",
     "         --precise             report column numbers in error messages",
     "         --help                display this text",
     "         --version             display version number",
@@ -23,19 +25,19 @@ static char *helptext[] = {
     NULL
 };
 
-static char *usagetext[] = {
+static const char *const usagetext[] = {
     "usage: halibut [--format[=filename]] [options] file.but [file.but...]",
     NULL
 };
 
 void help(void) {
-    char **p;
+    const char *const *p;
     for (p = helptext; *p; p++)
        puts(*p);
 }
 
 void usage(void) {
-    char **p;
+    const char *const *p;
     for (p = usagetext; *p; p++)
        puts(*p);
 }
@@ -43,3 +45,13 @@ void usage(void) {
 void showversion(void) {
     printf("Halibut, %s\n", version);
 }
+
+void listcharsets(void) {
+    int i = 0, c;
+    do {
+       c = charset_localenc_nth(i);
+       if (c == CS_NONE) break;
+       printf("%s\n", charset_to_localenc(c));
+       i++;
+    } while (1);
+}