working #3 vlad
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51
lab_3/vlad/Makefile
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51
lab_3/vlad/Makefile
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# Компилятор и флаги
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CC = gcc
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CFLAGS = -Wall -Wextra -std=c99 -pedantic
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# Целевые файлы
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TARGET_PARENT = parent
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TARGET_TASK11 = task11
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# Исходные файлы
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SRC_PARENT = parent.c
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SRC_TASK11 = task11.c
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# Объектные файлы
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OBJ_PARENT = $(SRC_PARENT:.c=.o)
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OBJ_TASK11 = $(SRC_TASK11:.c=.o)
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.PHONY: all clean help test
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all: $(TARGET_PARENT) $(TARGET_TASK11)
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$(TARGET_PARENT): $(OBJ_PARENT)
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$(CC) $(CFLAGS) -o $@ $^
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@echo "Родительская программа собрана: $@"
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$(TARGET_TASK11): $(OBJ_TASK11)
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$(CC) $(CFLAGS) -o $@ $^
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@echo "Программа лаб. работы №11 собрана: $@"
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%.o: %.c
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$(CC) $(CFLAGS) -c $< -o $@
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clean:
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rm -f $(TARGET_PARENT) $(TARGET_TASK11) $(OBJ_PARENT) $(OBJ_TASK11) input* output*
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@echo "Очистка завершена"
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help:
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@echo "Доступные цели:"
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@echo " all - собрать все"
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@echo " clean - удалить все скомпилированные файлы"
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@echo " test - запустить тестирование программы"
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test: all
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@echo "Создаем тестовые файлы..."
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@echo "abbaabbccdd" > input1.txt
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@echo "hello world !!" > input2.txt
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@echo "Запуск parent..."
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./$(TARGET_PARENT) 5 input1.txt output1.txt input2.txt output2.txt
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@echo "Содержимое output1.txt:"
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@cat output1.txt || echo "Файл output1.txt не найден"
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@echo "Содержимое output2.txt:"
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@cat output2.txt || echo "Файл output2.txt не найден"
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88
lab_3/vlad/parent.c
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88
lab_3/vlad/parent.c
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@@ -0,0 +1,88 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <string.h>
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#include <errno.h>
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int main(int argc, char *argv[]) {
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if (argc < 4) {
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fprintf(stderr,
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"Usage: parent <max_replacements> <input1.txt> <output1.txt> [<input2.txt> <output2.txt> ...]\n"
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" max_replacements: maximum number of replacements\n"
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" input/output: pairs of input and output files\n");
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return -1;
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}
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if ((argc - 2) % 2 != 0) {
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fprintf(stderr, "Error: number of input/output files must be even (pairs of input/output)\n");
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return -1;
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}
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const char *max_replacements_arg = argv[1];
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int num_pairs = (argc - 2) / 2;
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pid_t *child_pids = malloc(num_pairs * sizeof(pid_t));
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if (!child_pids) {
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perror("malloc failed");
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return -1;
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}
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for (int i = 0; i < num_pairs; i++) {
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const char *input_file = argv[2 + i * 2];
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const char *output_file = argv[2 + i * 2 + 1];
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pid_t pid = fork();
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if (pid < 0) {
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perror("fork failed");
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// Wait for already started children
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for (int j = 0; j < i; j++) {
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waitpid(child_pids[j], NULL, 0);
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}
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free(child_pids);
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return -1;
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}
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if (pid == 0) {
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// Child process
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printf("Child %d (PID=%d) processing %s -> %s\n", i + 1, getpid(), input_file, output_file);
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execl("./task11", "task11", input_file, output_file, max_replacements_arg, (char *) NULL);
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// If exec returns, error happened
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fprintf(stderr, "Child %d: execl failed for %s: %s\n", i + 1, input_file, strerror(errno));
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_exit(-1);
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}
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// Parent process
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child_pids[i] = pid;
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}
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printf("Parent process waiting for children...\n");
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int ret_code = 0;
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for (int i = 0; i < num_pairs; i++) {
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int status;
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pid_t pid = waitpid(child_pids[i], &status, 0);
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if (pid < 0) {
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perror("waitpid failed");
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continue;
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}
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if (WIFEXITED(status)) {
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int code = WEXITSTATUS(status);
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printf("Child %d (PID=%d) exited with code %d\n", i + 1, pid, code);
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if (code != 0) {
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ret_code = code;
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}
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} else if (WIFSIGNALED(status)) {
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printf("Child %d (PID=%d) terminated by signal %d\n", i + 1, pid, WTERMSIG(status));
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} else {
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printf("Child %d (PID=%d) ended abnormally\n", i + 1, pid);
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}
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}
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free(child_pids);
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printf("All children finished\n");
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return ret_code;
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}
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170
lab_3/vlad/task11.c
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170
lab_3/vlad/task11.c
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@@ -0,0 +1,170 @@
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#define RBUFSZ 4096
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#define WBUFSZ 4096
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static void die_perror(const char *what, const char *path, int exit_code) {
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int saved = errno;
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char msg[512];
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int n;
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if (path) {
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n = snprintf(msg, sizeof(msg), "%s: %s: %s\n", what, path, strerror(saved));
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} else {
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n = snprintf(msg, sizeof(msg), "%s: %s\n", what, strerror(saved));
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}
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if (n > 0) (void) write(STDERR_FILENO, msg, (size_t) n);
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_exit(exit_code);
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}
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static long long parse_ll(const char *s) {
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char *end = NULL;
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errno = 0;
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long long v = strtoll(s, &end, 10);
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if (errno != 0 || end == s || *end != '\0' || v < 0) {
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errno = EINVAL;
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return -1;
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}
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return v;
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}
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static void xwrite_all(int fd, const char *buf, size_t len, const char *path) {
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size_t off = 0;
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while (off < len) {
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ssize_t n = write(fd, buf + off, len - off);
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if (n < 0) {
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if (errno == EINTR) continue;
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die_perror("write failed", path, -1);
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}
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off += (size_t) n;
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}
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}
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int main(int argc, char *argv[]) {
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if (argc != 4) {
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const char *usage =
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"Usage: lab1_var11 <input.txt> <output.txt> <max_replacements>\n"
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"Variant 11: for every pair of identical consecutive characters, replace the second with a space.\n"
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" Stop after <max_replacements> replacements globally.\n";
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(void) write(STDERR_FILENO, usage, strlen(usage));
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return -1;
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}
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const char *in_path = argv[1];
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const char *out_path = argv[2];
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long long cap = parse_ll(argv[3]);
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if (cap < 0) {
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die_perror("invalid max_replacements", argv[3], -1);
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}
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int in_fd = open(in_path, O_RDONLY);
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if (in_fd < 0) {
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die_perror("open input failed", in_path, -1);
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}
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mode_t filePerms = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
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int out_fd = open(out_path, O_CREAT | O_WRONLY | O_TRUNC, filePerms);
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if (out_fd < 0) {
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die_perror("open output failed", out_path, -1);
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}
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char rbuf[RBUFSZ];
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char wbuf[WBUFSZ];
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size_t wlen = 0;
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long long total_replacements = 0;
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int replacing_enabled = 1;
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int have_prev = 0;
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unsigned char prev = 0;
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for (;;) {
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ssize_t n = read(in_fd, rbuf, sizeof(rbuf));
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if (n > 0) {
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for (ssize_t i = 0; i < n; i++) {
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unsigned char c = (unsigned char) rbuf[i];
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if (!have_prev) {
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prev = c;
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have_prev = 1;
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continue;
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}
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if (c == prev) {
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unsigned char out1 = prev;
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unsigned char out2 = c;
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if (replacing_enabled && total_replacements < cap) {
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out2 = ' ';
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total_replacements++;
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if (total_replacements == cap) {
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replacing_enabled = 0;
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}
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} else {
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replacing_enabled = 0;
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}
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if (wlen == sizeof(wbuf)) {
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xwrite_all(out_fd, wbuf, wlen, out_path);
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wlen = 0;
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}
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wbuf[wlen++] = (char) out1;
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if (wlen == sizeof(wbuf)) {
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xwrite_all(out_fd, wbuf, wlen, out_path);
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wlen = 0;
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}
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wbuf[wlen++] = (char) out2;
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have_prev = 0;
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} else {
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if (wlen == sizeof(wbuf)) {
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xwrite_all(out_fd, wbuf, wlen, out_path);
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wlen = 0;
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}
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wbuf[wlen++] = (char) prev;
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prev = c;
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have_prev = 1;
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}
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}
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} else if (n == 0) {
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if (have_prev) {
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if (wlen == sizeof(wbuf)) {
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xwrite_all(out_fd, wbuf, wlen, out_path);
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wlen = 0;
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}
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wbuf[wlen++] = (char) prev;
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have_prev = 0;
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}
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if (wlen > 0) {
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xwrite_all(out_fd, wbuf, wlen, out_path);
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wlen = 0;
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}
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break;
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} else {
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if (errno == EINTR) continue;
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die_perror("read failed", in_path, -1);
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}
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}
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if (close(in_fd) < 0) {
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die_perror("close input failed", in_path, -1);
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}
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if (close(out_fd) < 0) {
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die_perror("close output failed", out_path, -1);
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}
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char res[64];
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int m = snprintf(res, sizeof(res), "%lld\n", total_replacements);
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if (m > 0) {
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(void) write(STDOUT_FILENO, res, (size_t) m);
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}
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return 0;
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}
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