add internal menuviewer

1 files changed, 37 insertions, 22 deletions

diff --git a/menudriver.c b/menudriver.c
index 9043ee9..aa6d65c 100644
--- a/menudriver.c
+++ b/menudriver.c
@@ -13,10 +13,10 @@
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <sys/wait.h>
+#include <string.h>
 #include <signal.h>
 
 #ifndef PATH_MAX
@@ -27,7 +27,6 @@
 #endif
 #endif
 
-char *menuviewer;
 char *viewer = "less";
 
 #define VIEWERPAUSESATEND .
@@ -43,20 +42,18 @@ int fastback = 0;
 
 void callshell(char[]);
 void clrscr(void);
-void menudrive(char *);
+void menudrive(const char *, char *);
 void pushlast(void);
 void poplast(void);
-void settings(void);
+void settings(const char *, const char *, int);
 void singleton(char *);
 int subdir(void);
 
 char next[40] = "", cmd[80], last[40] = ".";
 int val;
 
-#include <string.h>
-#define index(s,c) strchr(s,c)
-
-static void wait_for_return(void) {
+static void wait_for_return(void)
+{
   printf("[Hit return to continue]");
   fflush(stdout);
   while (getchar() != '\n') {
@@ -64,21 +61,40 @@ static void wait_for_return(void) {
   }
 }
 
+static void view_menu(const char *command, const char *filename)
+{
+  if (command) {
+    char buf[PATH_MAX];
+    snprintf(buf, sizeof(buf), "%s %s", command, filename);
+    system(buf);
+    return;
+  }
+
+  FILE *f = fopen(filename, "r");
+  if (!f) {
+    fprintf(stderr, "menudriver: %s: %s\n", filename, strerror(errno));
+    return;
+  }
+
+  int c;
+  while ((c = fgetc(f)) != EOF) {
+    putchar(c);
+  }
+
+  fclose(f);
+}
+
 int main(int argc, char *argv[])
 {
   char *v = getenv("VIEWER");
   char *fb = getenv("RETURNTOMENU");
-  menuviewer = getenv("MENUVIEWER");
+  char *menuviewer = getenv("MENUVIEWER");
 
   if (argc > 2) {
     fprintf(stderr, "menudriver: wrong number of args\n");
     exit(1);
   }
 
-  if (!menuviewer) {
-    menuviewer = "cat";
-  }
-
   if (v) {
     viewer = v;
   }
@@ -87,7 +103,7 @@ int main(int argc, char *argv[])
     fastback = !(*fb == 'N' || *fb == 'n');
   }
 
-  menudrive(argc == 1 ? "." : argv[1]);
+  menudrive(menuviewer, argc == 1 ? "." : argv[1]);
 }
 
 /* checks if last is a number (and if so leaves value in val) */
@@ -109,7 +125,7 @@ int lastval(void)
   return (sscanf(last, "%d", &val) == 1);
 }
 
-void menudrive(char *dir)
+void menudrive(const char *menuviewer, char *dir)
 {
   char *np;
   int c;
@@ -133,8 +149,7 @@ void menudrive(char *dir)
 	bad = 0;
       }
 
-      snprintf(cmd, sizeof(cmd), "%s contents", menuviewer);
-      system(cmd);
+      view_menu(menuviewer, "contents");
       printf("::please type selection number (or return to exit):");
 
       /* read remainder of line into next, less leading white space */
@@ -180,7 +195,7 @@ void menudrive(char *dir)
     }
 
     if (stat(next, &st) == 0) {
-      if (strcmp(next, ".") == 0 || strcmp(next, "..") == 0 || index(next, '/')) {
+      if (strcmp(next, ".") == 0 || strcmp(next, "..") == 0 || strchr(next, '/')) {
 	bad = 1;
 	continue;
       }				/* no pathnames - see below */
@@ -255,7 +270,7 @@ void menudrive(char *dir)
 
     } else if (strcmp(next, "???") == 0) {
       /* ask to see menudriver settings */
-      settings();
+      settings(viewer, menuviewer, fastback);
       wait_for_return();
       next[0] = '\0';
 
@@ -356,11 +371,11 @@ void callshell(char v[])
   }
 }
 
-void settings(void)
+void settings(const char *viewer, const char *menuviewer, int fastback)
 {
   printf("current values of menudriver internal variables are\n\n");
-  printf("        VIEWER=%s\n", viewer);
-  printf("        MENUVIEWER=%s\n", menuviewer);
+  printf("        VIEWER=%s\n", viewer ? viewer : "(internal)");
+  printf("        MENUVIEWER=%s\n", menuviewer ? : "(internal)");
   printf("        RETURNTOMENU=%s\n", fastback ? "YES" : "NO");
   printf("\n\
 These can be modified by setting environment variables of the same names\n\n\