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36 lines
633 B
36 lines
633 B
/* rename -- rename a file |
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This function is in the public domain. */ |
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/* |
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@deftypefn Supplemental int rename (const char *@var{old}, const char *@var{new}) |
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Renames a file from @var{old} to @var{new}. If @var{new} already |
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exists, it is removed. |
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@end deftypefn |
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*/ |
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#include "ansidecl.h" |
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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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#include <errno.h> |
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#ifdef HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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int |
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rename (const char *zfrom, const char *zto) |
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{ |
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if (link (zfrom, zto) < 0) |
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{ |
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if (errno != EEXIST) |
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return -1; |
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if (unlink (zto) < 0 |
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|| link (zfrom, zto) < 0) |
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return -1; |
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} |
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return unlink (zfrom); |
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}
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