60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stdio.h>
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ssize_t write_all(int fd, char *buf, size_t count)
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{
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ssize_t ret;
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size_t cnt;
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for(cnt = count; cnt > 0; buf += ret, cnt -= ret) {
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ret = write(fd, buf, count);
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if(ret == -1) {
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// Datei kein Socket und nicht O_NONBLOCK, also
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// sollteâ„¢ kein EAGAIN kommen
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perror("write");
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exit(1);
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}
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// ret kann 0 sein, das heißt 0 Bytes wurden geschrieben
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}
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return count;
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}
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int main()
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{
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signed int fd_in = open("Dump_Esc.xml", O_RDONLY);
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if(fd_in == -1) {
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perror("open");
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exit(1);
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}
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signed int fd_out = creat("Dump_Esc_0.xml", 0640);
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if(fd_in == -1) {
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perror("creat");
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exit(1);
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}
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const size_t SIZ = 1024;
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char buf[SIZ];
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for(;;) {
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ssize_t ret = read(fd_in, buf, SIZ);
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if(!ret)
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break;
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for(size_t i=0; i<SIZ; i++) {
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if(buf[i] == '\0')
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buf[i] = '0';
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}
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// zurückgegeben wird hier immer der Count
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write_all(fd_out, buf, ret);
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}
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close(fd_out);
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close(fd_in);
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puts("Fertig.");
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return 0;
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}
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