Quick and dirty terminal_size() and yesno() functions, both of which need to be improved.

diff --git a/lib/lib.c b/lib/lib.c
index 82e32ae..a71e20a 100644 (file)
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -174,7 +174,8 @@ void xexec(char **argv)
 {
        toy_exec(argv);
        execvp(argv[0], argv);
-       error_exit("No %s", argv[0]);
+
+       perror_exit("exec %s", argv[0]);
 }
 
 void xaccess(char *path, int flags)
@@ -756,3 +757,51 @@ void crc_init(unsigned int *crc_table, int little_endian)
                crc_table[i] = c;
        }
 }
+
+// Quick and dirty query size of terminal, doesn't do ANSI probe fallback.
+// set *x=0 and *y=0 before calling to detect failure to set either, or
+// x=80 y=25 to provide defaults
+
+void terminal_size(unsigned *x, unsigned *y)
+{
+       struct winsize ws;
+       int i;
+
+       //memset(&ws, 0, sizeof(ws));
+       for (i=0; i<3; i++) {
+               if (ioctl(i, TIOCGWINSZ, &ws)) continue;
+               if (x) *x = ws.ws_col;
+               if (y) *y = ws.ws_row;
+       }
+       if (x) {
+               char *s = getenv("COLUMNS");
+
+               i = s ? atoi(s) : 0;
+               if (i>0) *x = i;
+       }
+       if (y) {
+               char *s = getenv("ROWS");
+
+               i = s ? atoi(s) : 0;
+               if (i>0) *y = i;
+       }
+}
+
+// This should use a raw tty, fixit later.
+int yesno(int def)
+{
+       char buf[16];
+       int i;
+
+       for (i=0; i<3 && !isatty(i); i++);
+       if (i == 3) return 1;
+
+       sprintf(buf, "(%c/%c):", def ? 'Y' : 'y', def ? 'n' : 'N');
+       write(i, buf, 6);
+       while (read(i, buf, 1)) {
+               if (isspace(*buf)) break;
+               if (tolower(*buf) == 'y') return 1;
+               if (tolower(*buf) == 'n') return 0;
+       }
+       return def;
+}

diff --git a/lib/lib.h b/lib/lib.h
index 6880462..b7f250b 100644 (file)
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -108,6 +108,9 @@ int copy_tempfile(int fdin, char *name, char **tempname);
 void delete_tempfile(int fdin, int fdout, char **tempname);
 void replace_tempfile(int fdin, int fdout, char **tempname);
 void crc_init(unsigned int *crc_table, int little_endian);
+void terminal_size(unsigned *x, unsigned *y);
+int yesno(int def);
+
 
 // getmountlist.c
 struct mtab_list {