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working kirill's

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This commit is contained in:
pajjilykk
2025-10-06 17:41:01 +07:00
parent 462b987abd
commit 6036a989cf
2 changed files with 35 additions and 27 deletions
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6
lab_1/kirill`s/in.txt
View File

@@ -1,2 +1,4 @@
123456 123456123456123456123456123456123456123456123456
123456 123456123456
123456123456
123456123456

56
lab_1/kirill`s/task18.cpp
View File

@@ -12,15 +12,28 @@
static void die_perror(const char *what, const char *path, int exit_code) { static void die_perror(const char *what, const char *path, int exit_code) {
int saved = errno; int saved = errno;
char msg[512]; char msg[512];
int n;
if (path) { 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 { } 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); _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) { static long long parse_ll(const char *s) {
char *end = NULL; char *end = NULL;
errno = 0; errno = 0;
@@ -36,7 +49,7 @@ int main(int argc, char *argv[]) {
if (argc != 4) { if (argc != 4) {
const char *usage = const char *usage =
"Usage: lab1_var_thirds_line <input.txt> <output.txt> <max_replacements>\n" "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)); (void) write(STDERR_FILENO, usage, strlen(usage));
return -1; return -1;
} }
@@ -49,7 +62,7 @@ int main(int argc, char *argv[]) {
int in_fd = open(in_path, O_RDONLY); int in_fd = open(in_path, O_RDONLY);
if (in_fd < 0) die_perror("open input failed", in_path, -1); 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); 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); 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; size_t wlen = 0;
long long total = 0; long long total = 0;
long long col = 0; /* position in current line starting from 1 */ long long col = 0;
int replacing_enabled = 1; int replacing_enabled = 1;
for (;;) { for (;;) {
@@ -68,10 +81,8 @@ int main(int argc, char *argv[]) {
unsigned char c = (unsigned char) rbuf[i]; unsigned char c = (unsigned char) rbuf[i];
if (c == '\n') { if (c == '\n') {
/* newline is written as-is and resets counter */
if (wlen == sizeof(wbuf)) { if (wlen == sizeof(wbuf)) {
ssize_t wrote = write(out_fd, wbuf, wlen); xwrite_all(out_fd, wbuf, wlen, out_path);
if (wrote < 0 || (size_t) wrote != wlen) die_perror("write failed", out_path, -1);
wlen = 0; wlen = 0;
} }
wbuf[wlen++] = '\n'; wbuf[wlen++] = '\n';
@@ -79,34 +90,30 @@ int main(int argc, char *argv[]) {
continue; continue;
} }
col++; /* advance within the current line */
unsigned char outc = c; unsigned char outc = c;
if (replacing_enabled && (col % 3 == 0)) {
if (total < cap) { col++;
outc = ' ';
total++; if (replacing_enabled && (col % 3 == 0) && total < cap) {
if (total == cap) replacing_enabled = 0; outc = ' ';
} else { total++;
replacing_enabled = 0; if (total == cap) replacing_enabled = 0;
}
} }
if (wlen == sizeof(wbuf)) { if (wlen == sizeof(wbuf)) {
ssize_t wrote = write(out_fd, wbuf, wlen); xwrite_all(out_fd, wbuf, wlen, out_path);
if (wrote < 0 || (size_t) wrote != wlen) die_perror("write failed", out_path, -1);
wlen = 0; wlen = 0;
} }
wbuf[wlen++] = (char) outc; wbuf[wlen++] = (char) outc;
} }
} else if (n == 0) { } else if (n == 0) {
if (wlen > 0) { if (wlen > 0) {
ssize_t wrote = write(out_fd, wbuf, wlen); xwrite_all(out_fd, wbuf, wlen, out_path);
if (wrote < 0 || (size_t) wrote != wlen) die_perror("write failed", out_path, -1);
wlen = 0; wlen = 0;
} }
break; break;
} else { } else {
if (errno == EINTR) continue;
die_perror("read failed", in_path, -1); 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); int m = snprintf(res, sizeof(res), "%lld\n", total);
if (m > 0) (void) write(STDOUT_FILENO, res, (size_t) m); if (m > 0) (void) write(STDOUT_FILENO, res, (size_t) m);
int exit_code = (int) (total & 0xFF); return 0;
return exit_code;
} }