error handling for freopen()

[smdp.git] / mdp.c

diff --git a/mdp.c b/mdp.c
index 9a71cd0..3d38e3f 100644 (file)
--- a/mdp.c
+++ b/mdp.c
@@ -32,6 +32,7 @@ void usage() {
     fprintf(stderr, "%s", "                  add it multiple times to increases debug level\n");
     fprintf(stderr, "%s", "  -f, --nofade    disable color fading in 256 color mode\n");
     fprintf(stderr, "%s", "  -h, --help      display this help and exit\n");
+    fprintf(stderr, "%s", "  -i, --invert    swap black and white color\n");
     fprintf(stderr, "%s", "  -t, --notrans   disable transparency in transparent terminal\n");
     fprintf(stderr, "%s", "\nWith no FILE, or when FILE is -, read standard input.\n\n");
     exit(EXIT_FAILURE);
@@ -50,12 +51,14 @@ void version() {
 int main(int argc, char *argv[]) {
     int notrans = 0;
     int nofade = 0;
+    int invert = 0;
 
     // define command-line options
     struct option longopts[] = {
         { "debug",   no_argument, 0, 'd' },
         { "nofade",  no_argument, 0, 'f' },
         { "help",    no_argument, 0, 'h' },
+        { "invert",  no_argument, 0, 'i' },
         { "notrans", no_argument, 0, 't' },
         { "version", no_argument, 0, 'v' },
         { 0, 0, 0, 0 }
@@ -63,11 +66,12 @@ int main(int argc, char *argv[]) {
 
     // parse command-line options
     int opt, debug = 0;
-    while ((opt = getopt_long(argc, argv, ":dfhtv", longopts, NULL)) != -1) {
+    while ((opt = getopt_long(argc, argv, ":dfhitv", longopts, NULL)) != -1) {
         switch(opt) {
             case 'd': debug += 1; break;
             case 'f': nofade = 1; break;
             case 'h': usage(); break;
+            case 'i': invert = 1; break;
             case 't': notrans = 1; break;
             case 'v': version(); break;
             case ':': fprintf(stderr, "%s: '%c' requires an argument\n", argv[0], optopt); usage(); break;
@@ -104,11 +108,20 @@ int main(int argc, char *argv[]) {
     // close file
     fclose(input);
 
+    // replace stdin with current tty if input was a pipe
+    if(input == stdin) {
+        input = freopen("/dev/tty", "rw", stdin);
+        if(!input) {
+            fprintf(stderr, "%s: %s: %s\n", argv[0], "/dev/tty", strerror(errno));
+            exit(EXIT_FAILURE);
+        }
+    }
+
     if(debug > 0) {
         markdown_debug(deck, debug);
     }
 
-    ncurses_display(deck, notrans, nofade);
+    ncurses_display(deck, notrans, nofade, invert);
 
     return(EXIT_SUCCESS);
 }