File 0002-dial-Fix-use-of-check_io_frontend.patch of Package minicom

From a546af2f16c50f32bc4cc92108f53beb9391d8f9 Mon Sep 17 00:00:00 2001
From: Adam Lackorzynski <adam@l4re.org>
Date: Mon, 25 May 2026 09:18:15 +0200
Subject: [PATCH] dial: Fix use of check_io_frontend

check_io_frontend shall use the bytes_read argument to know how many
bytes where actually returned.

Suggested by Andy Alt via https://salsa.debian.org/minicom-team/minicom/-/merge_requests/27

Signed-off-by: Adam Lackorzynski <adam@l4re.org>
---
 src/dial.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/src/dial.c b/src/dial.c
index b4ef461..9f53730 100644
--- a/src/dial.c
+++ b/src/dial.c
@@ -460,13 +460,14 @@ MainLoop:
     }
 
     /* Wait 'till the modem says something */
+    int buf_read_size = 1;
     modbuf[0] = 0;
     modidx = 0;
     s = buf;
     buf[0] = 0;
     while (dialtime > 0) {
       if (*s == 0) {
-        x = check_io_frontend(buf, sizeof(buf), NULL);
+        x = check_io_frontend(buf, sizeof(buf), &buf_read_size);
         s = buf;
       }
       if (x & 2) {
@@ -487,19 +488,21 @@ MainLoop:
         return retst;
       }
       if (x & 1) {
-        /* Data available from the modem. Put in buffer. */
-        if (*s == '\r' || *s == '\n') {
-          /* We look for [\r\n]STRING[\r\n] */
-          modbuf[modidx] = 0;
-          modidx = 0;
-        } else if (modidx < 127) {
-          /* Normal character. Add. */
-          modbuf[modidx++] = *s;
-          modbuf[modidx] = 0;
-        }
-        /* Skip to next received char */
-        if (*s)
-          s++;
+	if (s - buf < buf_read_size) {
+	  /* Data available from the modem. Put in buffer. */
+	  if (*s == '\r' || *s == '\n') {
+	    /* We look for [\r\n]STRING[\r\n] */
+	    modbuf[modidx] = 0;
+	    modidx = 0;
+	  } else if (modidx < 127) {
+	    /* Normal character. Add. */
+	    modbuf[modidx++] = *s;
+	    modbuf[modidx] = 0;
+	  }
+	  /* Skip to next received char */
+	  if (*s)
+	    s++;
+	}
         /* Only look when we got a whole line. */
         if (modidx == 0 &&
             !strncmp(modbuf, P_MCONNECT, strlen(P_MCONNECT))) {
-- 
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