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cp(1) can now support the syntax cp /bin/snake /

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This commit is contained in:
Jonas 'Sortie' Termansen 2011-11-22 17:57:10 +01:00
parent 1b56d01f17
commit 6986963b4b
1 changed files with 33 additions and 6 deletions
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39
utils/cp.cpp
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@ -18,23 +18,50 @@ bool writeall(int fd, const void* buffer, size_t len)
return true;
}
const char* basename(const char* path)
{
size_t len = strlen(path);
while ( len-- ) { if ( path[len] == '/' ) { return path + len + 1; } }
return path;
}
int main(int argc, char* argv[])
{
if ( argc != 3 ) { printf("usage: %s <from> <to>\n", argv[0]); return 0; }
int fromfd = open(argv[1], O_RDONLY);
if ( fromfd < 0 ) { printf("%s: %s: %s\n", argv[0], argv[1], strerror(errno)); return 1; }
const char* frompath = argv[1];
const char* topath = argv[2];
char tobuffer[256];
int tofd = open(argv[2], O_WRONLY | O_TRUNC | O_CREAT, 0777);
if ( tofd < 0 ) { printf("%s: %s: %s\n", argv[0], argv[2], strerror(errno)); return 1; }
int fromfd = open(frompath, O_RDONLY);
if ( fromfd < 0 ) { printf("%s: %s: %s\n", argv[0], frompath, strerror(errno)); return 1; }
int tofd = open(topath, O_WRONLY | O_TRUNC | O_CREAT, 0777);
if ( tofd < 0 )
{
if ( errno == EISDIR )
{
strcpy(tobuffer, topath);
if ( tobuffer[strlen(tobuffer)-1] != '/' ) { strcat(tobuffer, "/"); }
strcat(tobuffer, basename(frompath));
topath = tobuffer;
tofd = open(topath, O_WRONLY | O_TRUNC | O_CREAT, 0777);
}
if ( tofd < 0 )
{
printf("%s: %s: %s\n", argv[0], topath, strerror(errno));
return 1;
}
}
while ( true )
{
const size_t BUFFER_SIZE = 4096;
char buffer[BUFFER_SIZE];
ssize_t bytesread = read(fromfd, buffer, BUFFER_SIZE);
if ( bytesread < 0 ) { printf("%s: %s: %s\n", argv[0], argv[1], strerror(errno)); return 1; }
if ( bytesread < 0 ) { printf("%s: %s: %s\n", argv[0], frompath, strerror(errno)); return 1; }
if ( bytesread == 0 ) { return 0; }
if ( !writeall(tofd, buffer, bytesread) ) { printf("%s: %s: %s\n", argv[0], argv[2], strerror(errno)); return 1; }
if ( !writeall(tofd, buffer, bytesread) ) { printf("%s: %s: %s\n", argv[0], topath, strerror(errno)); return 1; }
}
}