Scan codes debugging functionality.
./linenoise_example --scancodes
diff --git a/example.c b/example.c
index 5fdc9d1..90030ad 100644
--- a/example.c
+++ b/example.c
@@ -22,8 +22,11 @@
if (!strcmp(*argv,"--multiline")) {
linenoiseSetMultiLine(1);
printf("Multi-line mode enabled.\n");
+ } else if (!strcmp(*argv,"--scancodes")) {
+ linenoisePrintScanCodes();
+ exit(0);
} else {
- fprintf(stderr, "Usage: %s [--multiline]\n", prgname);
+ fprintf(stderr, "Usage: %s [--multiline] [--scancodes]\n", prgname);
exit(1);
}
}
diff --git a/linenoise.c b/linenoise.c
index f0b1c63..8e6234d 100644
--- a/linenoise.c
+++ b/linenoise.c
@@ -795,6 +795,33 @@
return l.len;
}
+/* This special mode is used by linenoise in order to print scan codes
+ * on screen for debugging / development purposes. It is implemented
+ * by the linenoise_example program using the --scancodes option. */
+void linenoisePrintScanCodes(void) {
+ char quit[4];
+
+ printf("Linenoise scan codes debugging mode.\n"
+ "Press keys to see scan codes. Type 'quit' at any time to exit.\n");
+ if (enableRawMode(STDIN_FILENO) == -1) return;
+ memset(quit,' ',4);
+ while(1) {
+ char c;
+ int nread;
+
+ nread = read(STDIN_FILENO,&c,1);
+ if (nread <= 0) continue;
+ memmove(quit,quit+1,sizeof(quit)-1); /* shift string to left. */
+ quit[sizeof(quit)-1] = c; /* Insert current char on the right. */
+ if (memcmp(quit,"quit",sizeof(quit)) == 0) break;
+
+ printf("%02x (%d) (type quit to exit)\n", (int)c, (int)c);
+ printf("\x1b[0G"); /* Go left edge manually, we are in raw mode. */
+ fflush(stdout);
+ }
+ disableRawMode(STDIN_FILENO);
+}
+
/* This function calls the line editing function linenoiseEdit() using
* the STDIN file descriptor set in raw mode. */
static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) {
diff --git a/linenoise.h b/linenoise.h
index 9549c91..b767774 100644
--- a/linenoise.h
+++ b/linenoise.h
@@ -57,6 +57,7 @@
int linenoiseHistoryLoad(const char *filename);
void linenoiseClearScreen(void);
void linenoiseSetMultiLine(int ml);
+void linenoisePrintScanCodes(void);
#ifdef __cplusplus
}
