From 6036a989cff827dd312b06a6101dbfd914ddd215 Mon Sep 17 00:00:00 2001
From: pajjilykk <pgoldendragon@gmail.com>
Date: Mon, 6 Oct 2025 17:41:01 +0700
Subject: [PATCH] working kirill's

---
 lab_1/kirill`s/in.txt     |  6 +++--
 lab_1/kirill`s/task18.cpp | 56 ++++++++++++++++++++++-----------------
 2 files changed, 35 insertions(+), 27 deletions(-)

diff --git a/lab_1/kirill`s/in.txt b/lab_1/kirill`s/in.txt
index f2b6b71..ec56556 100644
--- a/lab_1/kirill`s/in.txt
+++ b/lab_1/kirill`s/in.txt
@@ -1,2 +1,4 @@
-123456
-123456
\ No newline at end of file
+123456123456123456123456123456123456123456123456
+123456123456
+123456123456
+123456123456
diff --git a/lab_1/kirill`s/task18.cpp b/lab_1/kirill`s/task18.cpp
index 13839d7..76976b6 100644
--- a/lab_1/kirill`s/task18.cpp
+++ b/lab_1/kirill`s/task18.cpp
@@ -12,15 +12,28 @@
 static void die_perror(const char *what, const char *path, int exit_code) {
     int saved = errno;
     char msg[512];
+    int n;
     if (path) {
-        snprintf(msg, sizeof(msg), "%s: %s: %s\n", what, path, strerror(saved));
+        n = snprintf(msg, sizeof(msg), "%s: %s: %s\n", what, path, strerror(saved));
     } else {
-        snprintf(msg, sizeof(msg), "%s: %s\n", what, strerror(saved));
+        n = snprintf(msg, sizeof(msg), "%s: %s\n", what, strerror(saved));
     }
-    (void) write(STDERR_FILENO, msg, strlen(msg));
+    if (n > 0) (void) write(STDERR_FILENO, msg, (size_t) n);
     _exit(exit_code);
 }
 
+static void xwrite_all(int fd, const char *buf, size_t len, const char *path) {
+    size_t off = 0;
+    while (off < len) {
+        ssize_t n = write(fd, buf + off, len - off);
+        if (n < 0) {
+            if (errno == EINTR) continue;
+            die_perror("write failed", path, -1);
+        }
+        off += (size_t) n;
+    }
+}
+
 static long long parse_ll(const char *s) {
     char *end = NULL;
     errno = 0;
@@ -36,7 +49,7 @@ int main(int argc, char *argv[]) {
     if (argc != 4) {
         const char *usage =
                 "Usage: lab1_var_thirds_line <input.txt> <output.txt> <max_replacements>\n"
-                "Replace every third byte in each line with a space; counter resets after each newline.\n";
+                "Replace every third non-newline byte in each line with a space; counter resets after LF.\n";
         (void) write(STDERR_FILENO, usage, strlen(usage));
         return -1;
     }
@@ -49,7 +62,7 @@ int main(int argc, char *argv[]) {
     int in_fd = open(in_path, O_RDONLY);
     if (in_fd < 0) die_perror("open input failed", in_path, -1);
 
-    mode_t perms = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; /* 0666 */
+    mode_t perms = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
     int out_fd = open(out_path, O_CREAT | O_WRONLY | O_TRUNC, perms);
     if (out_fd < 0) die_perror("open output failed", out_path, -1);
 
@@ -58,7 +71,7 @@ int main(int argc, char *argv[]) {
     size_t wlen = 0;
 
     long long total = 0;
-    long long col = 0; /* position in current line starting from 1 */
+    long long col = 0;
     int replacing_enabled = 1;
 
     for (;;) {
@@ -68,10 +81,8 @@ int main(int argc, char *argv[]) {
                 unsigned char c = (unsigned char) rbuf[i];
 
                 if (c == '\n') {
-                    /* newline is written as-is and resets counter */
                     if (wlen == sizeof(wbuf)) {
-                        ssize_t wrote = write(out_fd, wbuf, wlen);
-                        if (wrote < 0 || (size_t) wrote != wlen) die_perror("write failed", out_path, -1);
+                        xwrite_all(out_fd, wbuf, wlen, out_path);
                         wlen = 0;
                     }
                     wbuf[wlen++] = '\n';
@@ -79,34 +90,30 @@ int main(int argc, char *argv[]) {
                     continue;
                 }
 
-                col++; /* advance within the current line */
-
                 unsigned char outc = c;
-                if (replacing_enabled && (col % 3 == 0)) {
-                    if (total < cap) {
-                        outc = ' ';
-                        total++;
-                        if (total == cap) replacing_enabled = 0;
-                    } else {
-                        replacing_enabled = 0;
-                    }
+
+                col++;
+
+                if (replacing_enabled && (col % 3 == 0) && total < cap) {
+                    outc = ' ';
+                    total++;
+                    if (total == cap) replacing_enabled = 0;
                 }
 
                 if (wlen == sizeof(wbuf)) {
-                    ssize_t wrote = write(out_fd, wbuf, wlen);
-                    if (wrote < 0 || (size_t) wrote != wlen) die_perror("write failed", out_path, -1);
+                    xwrite_all(out_fd, wbuf, wlen, out_path);
                     wlen = 0;
                 }
                 wbuf[wlen++] = (char) outc;
             }
         } else if (n == 0) {
             if (wlen > 0) {
-                ssize_t wrote = write(out_fd, wbuf, wlen);
-                if (wrote < 0 || (size_t) wrote != wlen) die_perror("write failed", out_path, -1);
+                xwrite_all(out_fd, wbuf, wlen, out_path);
                 wlen = 0;
             }
             break;
         } else {
+            if (errno == EINTR) continue;
             die_perror("read failed", in_path, -1);
         }
     }
@@ -118,6 +125,5 @@ int main(int argc, char *argv[]) {
     int m = snprintf(res, sizeof(res), "%lld\n", total);
     if (m > 0) (void) write(STDOUT_FILENO, res, (size_t) m);
 
-    int exit_code = (int) (total & 0xFF);
-    return exit_code;
+    return 0;
 }