add directory study

study/linux-travel/MINIX-1.5/1.5/Source/commands/tset.c

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+/* tset - set the TERM variable		Author: Terrence Holm */
+
+#include <sys/types.h>
+#include <string.h>
+#include <termcap.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#define  LINE_LENGTH  40	/* Max length in /etc/ttytype	 */
+#define  TC_BUFFER  1024	/* Size of termcap(3) buffer	 */
+
+char *ttyname();
+
+/****************************************************************/
+/*								*/
+/*	eval `tset  [ device_type ]`				*/
+/*								*/
+/*	"device_type" is the new name for $TERM. If no		*/
+/*	type is supplied then /etc/ttytype is scanned for	*/
+/*	the current port.					*/
+/*								*/
+/*	This program returns the string:			*/
+/*								*/
+/*		TERM= . . .					*/
+/*								*/
+/****************************************************************/
+/*								*/
+/*	Login(1) sets a default for $TERM, so for logging-in	*/
+/*	to any terminal place the following in ".profile":	*/
+/*								*/
+/*		eval `tset`					*/
+/*								*/
+/*	To change $TERM during a session:			*/
+/*								*/
+/*		eval `tset device_type`				*/
+/*								*/
+/****************************************************************/
+
+
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+  char *name;
+  FILE *f;
+  char line[LINE_LENGTH];
+
+
+  if (argc > 2) {
+	fprintf(stderr, "Usage:  %s  [ device_type ]\n", argv[0]);
+	exit(1);
+  }
+  if (argc == 2) {
+	Find_Termcap(argv[1]);
+	exit(0);
+  }
+
+  /* No terminal name supplied, so use the current device	 */
+
+  if ((name = ttyname(0)) == (char *) NULL)
+	Error("Can not determine the user's terminal");
+
+  name += 5;			/* Chop off "/dev/" part	 */
+
+  /* Look up the default terminal type in /etc/ttytype		 */
+
+  if ((f = fopen("/etc/ttytype", "r")) == (FILE *) NULL)
+	Error("Can not open /etc/ttytype");
+
+  while (fgets(line, LINE_LENGTH, f) != (char *) NULL) {
+	char *space = strchr(line, ' ');
+
+	line[strlen(line) - 1] = '\0';	/* Remove '\n'		 */
+
+	if (strcmp(space + 1, name) == 0) {
+		*space = '\0';
+		Find_Termcap(line);
+		exit(0);
+	}
+  }
+
+  Error("Can not find your terminal in /etc/ttytype");
+}
+
+Find_Termcap(terminal)
+char *terminal;
+{
+  char termcap[TC_BUFFER];
+
+  if (tgetent(termcap, terminal) != 1)
+	Error("No termcap for your terminal type");
+
+  /* In real Unix the $TERMCAP would also be returned here  */
+  printf("TERM=%s;\n", terminal);
+}
+
+Error(msg)
+char *msg;
+{
+  fprintf(stderr, "tset: %s\n", msg);
+  exit(1);
+}