| 1 | /* rename -- rename a file |
| 2 | This function is in the public domain. */ |
| 3 | |
| 4 | /* |
| 5 | |
| 6 | @deftypefn Supplemental int rename (const char *@var{old}, const char *@var{new}) |
| 7 | |
| 8 | Renames a file from @var{old} to @var{new}. If @var{new} already |
| 9 | exists, it is removed. |
| 10 | |
| 11 | @end deftypefn |
| 12 | |
| 13 | */ |
| 14 | |
| 15 | #ifdef HAVE_CONFIG_H |
| 16 | #include "config.h" |
| 17 | #endif |
| 18 | #include <errno.h> |
| 19 | #ifdef HAVE_UNISTD_H |
| 20 | #include <unistd.h> |
| 21 | #endif |
| 22 | |
| 23 | int |
| 24 | rename (zfrom, zto) |
| 25 | char *zfrom; |
| 26 | char *zto; |
| 27 | { |
| 28 | if (link (zfrom, zto) < 0) |
| 29 | { |
| 30 | if (errno != EEXIST) |
| 31 | return -1; |
| 32 | if (unlink (zto) < 0 |
| 33 | || link (zfrom, zto) < 0) |
| 34 | return -1; |
| 35 | } |
| 36 | return unlink (zfrom); |
| 37 | } |