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121 lines
2.2 KiB
121 lines
2.2 KiB
#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/uio.h>
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#define BUF_MAX 44
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#define RDWR_MAX 1
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#if RDWR_MAX > 1
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int
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main(int argc, char **argv) __attribute__((optnone))
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{
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char buf[RDWR_MAX][BUF_MAX] = { 0 };
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printf("%s enter [in:%s, out:%s]\n", argv[0], argv[1], argv[2]);
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int fdr = open(argv[1], O_RDONLY, S_IRUSR | S_IRGRP);
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if (fdr < 0) {
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perror("fopen");
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return -1;
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}
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int fdw = creat(argv[2], S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
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if (fdw < 0) {
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perror("creat");
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return -1;
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}
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int n = 0;
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struct iovec iov[RDWR_MAX] = { 0 };
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for (int i = 0; i < RDWR_MAX; i++) {
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iov[i].iov_base = buf[i];
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iov[i].iov_len = BUF_MAX;
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}
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while ((n = readv(fdr, iov, RDWR_MAX)) > 0) {
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int wvcnt = n / BUF_MAX;
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if (n % BUF_MAX) {
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iov[wvcnt].iov_len = n % BUF_MAX;
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wvcnt++;
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}
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if (writev(fdw, iov, wvcnt) != n) perror("writev");
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memset(buf, 0, RDWR_MAX * BUF_MAX);
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for (int i = 0; i < RDWR_MAX; i++) {
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iov[i].iov_base = buf[i];
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iov[i].iov_len = BUF_MAX;
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}
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n = 0;
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}
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close(fdr);
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close(fdw);
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printf("%s done\n", argv[0]);
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return 0;
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}
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#else
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int
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main(int argc, char **argv) __attribute__((optnone))
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{
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char buf[BUF_MAX] = { 0 };
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printf("%s enter [in:%s, out:%s]\n", argv[0], argv[1], argv[2]);
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#ifdef USE_OPEN
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int fdr = open(argv[1], O_RDONLY, S_IRUSR | S_IRGRP);
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if (fdr < 0) {
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perror("fopen");
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return -1;
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}
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int fdw = creat(argv[2], S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
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if (fdw < 0) {
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perror("creat");
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return -1;
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}
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int n = 0;
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while ((n = read(fdr, buf, BUF_MAX)) > 0) {
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if (write(fdw, buf, n) != n) perror("write");
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memset(buf, 0, BUF_MAX);
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n = 0;
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}
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if (n < 0) perror("read");
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close(fdr);
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close(fdw);
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#else
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FILE *fpr = fopen(argv[1], "r");
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if (!fpr) {
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perror("fopen");
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return -1;
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}
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FILE *fpw = fopen(argv[2], "w");
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if (!fpw) {
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perror("fopen");
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return -1;
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}
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while (!feof(fpr)) {
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char *p = NULL;
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if ((p = fgets(buf, BUF_MAX, fpr)) == NULL)
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perror("fgets");
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else {
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if (fputs(p, fpw) < 0) perror("fputs");
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p = NULL;
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}
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memset(buf, 0, BUF_MAX);
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}
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fclose(fpr);
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fclose(fpw);
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#endif
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printf("%s done\n", argv[0]);
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return 0;
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}
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#endif
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