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(FILE_BASENAME_CONCAT): Omit unnecessary slashes in the

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boundary between DEST and SOURCE in the result.
This commit is contained in:
Paul Eggert 2005-10-28 22:17:00 +00:00
parent f6d480b0a7
commit 50a6da201b
1 changed files with 11 additions and 5 deletions
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16
src/ln.c
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@ -54,7 +54,10 @@
#endif
/* Construct a string NEW_DEST by concatenating DEST, a slash, and
basename(SOURCE) in alloca'd memory. Don't modify DEST or SOURCE. */
basename (SOURCE) in alloca'd memory. Don't modify DEST or SOURCE.
Omit unnecessary slashes in the boundary between DEST and SOURCE in
the result; they can cause harm if "/" and "//" denote different
directories. */
#define FILE_BASENAME_CONCAT(new_dest, dest, source) \
do \
@ -62,15 +65,18 @@
const char *source_base; \
char *tmp_source; \
size_t buf_len = strlen (source) + 1; \
size_t dest_len = strlen (dest); \
\
tmp_source = alloca (buf_len); \
memcpy (tmp_source, (source), buf_len); \
strip_trailing_slashes (tmp_source); \
source_base = base_name (tmp_source); \
\
(new_dest) = alloca (strlen ((dest)) + 1 \
+ strlen (source_base) + 1); \
stpcpy (stpcpy (stpcpy ((new_dest), (dest)), "/"), source_base);\
source_base += (source_base[0] == '/'); \
dest_len -= (dest_len != 0 && (dest)[dest_len - 1] == '/'); \
(new_dest) = alloca (dest_len + 1 + strlen (source_base) + 1); \
memcpy (new_dest, dest, dest_len); \
(new_dest)[dest_len] = '/'; \
strcpy ((new_dest) + dest_len + 1, source_base); \
} \
while (0)