Merge pull request #157 from hartwork/fix-for-o1

 Fix crash with `-O1` on Ctrl+C + address `-O1` warnings + make CI compile with `-O1`

Author: tenox7

.github/workflows/linux_and_macos.yml

@@ -124,7 +124,7 @@ jobs:
 
           ${MAKE} --version 2>/dev/null || true
 
-          CFLAGS="-std=gnu99 -pedantic -Werror ${sanitizer}" LDFLAGS="${as_needed} ${sanitizer}" ${MAKE}
+          CFLAGS="-std=gnu99 -pedantic -Werror ${sanitizer} -O1" LDFLAGS="${as_needed} ${sanitizer}" ${MAKE}
 
       - name: 'Install'
         env:

recordings/expected.txt

@@ -19,7 +19,7 @@
 |  │                                                                                       |
 |  └─────────────────────────────────────────────────────────────────────────────────────> |
 |     X                                                           Thu Jan  1 00:00:00 1970 |
-|                                                  https://github.com/tenox7/ttyplot 1.6.0 |
+|                                                  https://github.com/tenox7/ttyplot 1.6.1 |
 +------------------------------------------------------------------------------------------+
 
 [90x20] Frame 2:
@@ -43,7 +43,7 @@
 |  │                                                                                    XX |
 |  └─────────────────────────────────────────────────────────────────────────────────────> |
 |     X last=3.0 min=1.0 max=3.0 avg=2.0                          Thu Jan  1 00:00:00 1970 |
-|       last=4.0 min=2.0 max=4.0 avg=3.0           https://github.com/tenox7/ttyplot 1.6.0 |
+|       last=4.0 min=2.0 max=4.0 avg=3.0           https://github.com/tenox7/ttyplot 1.6.1 |
 +------------------------------------------------------------------------------------------+
 
 [90x20] Frame 3:
@@ -67,6 +67,6 @@
 |  │                                                                                    XX |
 |  └─────────────────────────────────────────────────────────────────────────────────────> |
 |     X last=3.0 min=1.0 max=3.0 avg=2.0                          Thu Jan  1 00:00:00 1970 |
-|       last=4.0 min=2.0 max=4.0 avg=3.0           https://github.com/tenox7/ttyplot 1.6.0 |
+|       last=4.0 min=2.0 max=4.0 avg=3.0           https://github.com/tenox7/ttyplot 1.6.1 |
 +------------------------------------------------------------------------------------------+
 

snap/snapcraft.yaml

@@ -1,5 +1,5 @@
 name: ttyplot
-version: 1.6.0
+version: 1.6.1
 summary: realtime plotting utility for terminal/console with data input from stdin
 description: |
   takes data from standard input / unix pipeline,

stresstest.c

@@ -83,16 +83,20 @@ int main(int argc, char *argv[]) {
             size_t send_pos = 0;
             while (buffer_pos - send_pos >= 16) {
                 const size_t bytes_to_send = 1 + rand() % 16;  // 1..16
-                write(STDOUT_FILENO, buffer + send_pos, bytes_to_send);
+                const ssize_t bytes_sent = write(STDOUT_FILENO, buffer + send_pos, bytes_to_send);
                 usleep(50);  // let ttyplot read this before proceeding
-                send_pos += bytes_to_send;
+                if (bytes_sent > 0)
+                    send_pos += bytes_sent;
             }
             if (send_pos > 0 && send_pos < buffer_pos)
                 memmove(buffer, buffer + send_pos, buffer_pos - send_pos);
             buffer_pos -= send_pos;
         } else {
-            write(STDOUT_FILENO, buffer, buffer_pos);
-            buffer_pos = 0;
+            const ssize_t bytes_sent = write(STDOUT_FILENO, buffer, buffer_pos);
+            if ((bytes_sent > 0) && ((size_t)bytes_sent < buffer_pos))
+                memmove(buffer, buffer + bytes_sent, buffer_pos - bytes_sent);
+            if (bytes_sent > 0)
+                buffer_pos -= bytes_sent;
         }
         usleep(delay);
     }

ttyplot.1

@@ -1,4 +1,4 @@
-.Dd November 27, 2023
+.Dd December 25, 2023
 .Dt TTYPLOT 1
 .Os
 .Sh NAME

ttyplot.c

@@ -39,7 +39,7 @@
 #define STR(x) STR_(x)
 #define VERSION_MAJOR 1
 #define VERSION_MINOR 6
-#define VERSION_PATCH 0
+#define VERSION_PATCH 1
 #define VERSION_STR STR(VERSION_MAJOR) "." STR(VERSION_MINOR) "." STR(VERSION_PATCH)
 
 #define T_RARR '>'
@@ -282,7 +282,10 @@ static void paint_plot(void) {
 // (Related: https://stackoverflow.com/q/62315082)
 static void signal_handler(int signum) {
     const unsigned char signal_number = (unsigned char) signum;  // signum is either 2 (SIGINT) or 28 (SIGWINCH)
-    write(signal_write_fd, &signal_number, 1);
+    ssize_t write_res;
+    do {
+        write_res = write(signal_write_fd, &signal_number, 1);
+    } while ((write_res == -1) && (errno == EINTR));
 }
 
 static void redraw_screen(const char * errstr) {
@@ -478,7 +481,7 @@ static int wait_for_events(int signal_read_fd, int tty, bool stdin_is_open, stru
             ret |= EVENT_SIGNAL_READABLE;
         }
 
-        if (FD_ISSET(tty, &read_fds)) {
+        if ((tty != -1) && FD_ISSET(tty, &read_fds)) {
             ret |= EVENT_TTY_READABLE;
         }