51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <error.h>
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#include <string.h>
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const char* basename(const char* path)
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{
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size_t len = strlen(path);
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while ( len-- ) { if ( path[len] == '/' ) { return path + len + 1; } }
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return path;
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}
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int main(int argc, char* argv[])
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{
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if ( argc != 3 ) { printf("usage: %s <from> <to>\n", argv[0]); return 0; }
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const char* frompath = argv[1];
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const char* topath = argv[2];
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char tobuffer[256];
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int fromfd = open(frompath, O_RDONLY);
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if ( fromfd < 0 ) { error(1, errno, "%s", frompath); return 1; }
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int tofd = open(topath, O_WRONLY | O_TRUNC | O_CREAT, 0777);
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if ( tofd < 0 )
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{
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if ( errno == EISDIR )
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{
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strcpy(tobuffer, topath);
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if ( tobuffer[strlen(tobuffer)-1] != '/' ) { strcat(tobuffer, "/"); }
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strcat(tobuffer, basename(frompath));
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topath = tobuffer;
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tofd = open(topath, O_WRONLY | O_TRUNC | O_CREAT, 0777);
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}
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if ( tofd < 0 ) { error(1, errno, "%s", topath); return 1; }
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}
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while ( true )
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{
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const size_t BUFFER_SIZE = 4096;
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char buffer[BUFFER_SIZE];
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ssize_t bytesread = read(fromfd, buffer, BUFFER_SIZE);
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if ( bytesread < 0 ) { error(1, errno, "read: %s", frompath); return 1; }
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if ( bytesread == 0 ) { return 0; }
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if ( writeall(tofd, buffer, bytesread) ) { error(1, errno, "write: %s", topath); return 1; }
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}
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}
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