fix shii

lab_1/12_first_symbols_to_spaces.cpp

@@ -1,31 +1,50 @@
-// Task 12 (Ubuntu): replace every char equal to the first char of its line with a space.
-// Usage: ./task12 <input_file>  → writes "<input_file>.out" and prints replacement count.
-
 #include <iostream>
 #include <fstream>
 #include <string>
 #include <sys/stat.h>
+#include <cerrno>
+#include <cstdlib>
+#include <climits>
 
-// True if file exists (POSIX stat)
 static bool file_exists(const std::string &path) {
     struct stat st{};
-    return ::stat(path.c_str(), &st) == 0;
+    return ::stat(path.c_str(), &st) == 0; // stat success => exists [web:59]
 }
 
-// "<name>.out" by replacing last extension or appending if none
 static std::string make_out_name(const std::string &in) {
     std::size_t pos = in.find_last_of('.');
     if (pos == std::string::npos) return in + ".out";
     return in.substr(0, pos) + ".out";
 }
 
-int main(int argc, char *argv[]) {
-    if (argc != 2) {
-        std::cerr << "Usage: " << argv[0] << " <input_file>\n";
+static void print_usage(const char* prog) {
+    std::cerr << "Usage: " << prog << " <input_file> <replace_count>\n"; // positional args [web:59]
+}
+
+static bool parse_ll(const char* s, long long& out) {
+    if (!s || !*s) return false;
+    errno = 0;
+    char* end = nullptr;
+    long long v = std::strtoll(s, &end, 10); // use endptr and errno [web:59]
+    if (errno == ERANGE) return false;
+    if (end == s || *end != '\0') return false;
+    out = v;
+    return true;
+}
+
+int main(int argc, char* argv[]) {
+    if (argc != 3) {
+        print_usage(argv[0]);
         return -1;
     }
 
     std::string in_path = argv[1];
+    long long replace_limit = 0;
+    if (!parse_ll(argv[2], replace_limit) || replace_limit < 0) {
+        std::cerr << "Error: replace_count must be a non-negative integer.\n";
+        return -1;
+    }
+
     if (!file_exists(in_path)) {
         std::cerr << "Error: input file does not exist.\n";
         return -1;
@@ -44,18 +63,17 @@ int main(int argc, char *argv[]) {
         return -1;
     }
 
-    long long replacements = 0;
+    long long performed = 0;
     std::string line;
 
-    while (std::getline(in, line)) {
+    while (performed < replace_limit && std::getline(in, line)) { // stop early when limit hit [web:59]
         if (!line.empty()) {
             char first = line.front();
             for (char &c: line) {
-                if (c == first) {
-                    if (c != ' ') {
-                        c = ' ';
-                        ++replacements;
-                    } // count only real changes
+                if (c == first && c != ' ') {
+                    c = ' ';
+                    ++performed;
+                    if (performed >= replace_limit) break; // cap reached [web:44]
                 }
             }
         }
@@ -67,6 +85,23 @@ int main(int argc, char *argv[]) {
         }
     }
 
-    std::cout << replacements << std::endl;
-    return static_cast<int>(replacements);
+    // If limit reached mid-file, copy the rest unchanged
+    if (performed >= replace_limit) { // stream may be mid-line or between lines [web:59]
+        // Write remaining lines as-is
+        if (!in.eof()) {
+            // Flush any remaining part of current line already written; then dump rest
+            std::string rest;
+            while (std::getline(in, rest)) {
+                out << rest;
+                if (!in.eof()) out << '\n';
+                if (!out) {
+                    std::cerr << "Error: write error.\n";
+                    return -1;
+                }
+            }
+        }
+    }
+
+    std::cout << performed << std::endl; // print actual replacements up to limit [web:59]
+    return 0; // success [web:59]
 }

lab_1/run.sh

@@ -1 +1 @@
-./12_first_symbols_to_spaces file.in
+./12_first_symbols_to_spaces file.in 3