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Introduce write_bytes_to_new_file().

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Introduce write_bytes_to_new_file(), a function which writes bytes to
a file only if that file did not exist.
This commit is contained in:
George Kadianakis 2011-11-26 18:56:49 +01:00
parent fa013e1bc5
commit f28014bf1a
2 changed files with 31 additions and 14 deletions
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42
src/common/util.c
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@ -2137,13 +2137,12 @@ write_chunks_to_file(const char *fname, const smartlist_t *chunks, int bin)
return write_chunks_to_file_impl(fname, chunks, flags); return write_chunks_to_file_impl(fname, chunks, flags);
} }
/** As write_str_to_file, but does not assume a NUL-terminated /** Write <b>len</b> bytes, starting at <b>str</b>, to <b>fname</b>
* string. Instead, we write <b>len</b> bytes, starting at <b>str</b>. */ using the open() flags passed in <b>flags</b>. */
int static int
write_bytes_to_file(const char *fname, const char *str, size_t len, write_bytes_to_file_impl(const char *fname, const char *str, size_t len,
int bin) int flags)
{ {
int flags = OPEN_FLAGS_REPLACE|(bin?O_BINARY:O_TEXT);
int r; int r;
sized_chunk_t c = { str, len }; sized_chunk_t c = { str, len };
smartlist_t *chunks = smartlist_create(); smartlist_t *chunks = smartlist_create();
@ -2153,20 +2152,35 @@ write_bytes_to_file(const char *fname, const char *str, size_t len,
return r; return r;
} }
/** As write_str_to_file, but does not assume a NUL-terminated
* string. Instead, we write <b>len</b> bytes, starting at <b>str</b>. */
int
write_bytes_to_file(const char *fname, const char *str, size_t len,
int bin)
{
return write_bytes_to_file_impl(fname, str, len,
OPEN_FLAGS_REPLACE|(bin?O_BINARY:O_TEXT));
}
/** As write_bytes_to_file, but if the file already exists, append the bytes /** As write_bytes_to_file, but if the file already exists, append the bytes
* to the end of the file instead of overwriting it. */ * to the end of the file instead of overwriting it. */
int int
append_bytes_to_file(const char *fname, const char *str, size_t len, append_bytes_to_file(const char *fname, const char *str, size_t len,
int bin) int bin)
{ {
int flags = OPEN_FLAGS_APPEND|(bin?O_BINARY:O_TEXT); return write_bytes_to_file_impl(fname, str, len,
int r; OPEN_FLAGS_APPEND|(bin?O_BINARY:O_TEXT));
sized_chunk_t c = { str, len }; }
smartlist_t *chunks = smartlist_create();
smartlist_add(chunks, &c); /** Like write_str_to_file(), but also return -1 if there was a file
r = write_chunks_to_file_impl(fname, chunks, flags); already residing in <b>fname</b>. */
smartlist_free(chunks); int
return r; write_bytes_to_new_file(const char *fname, const char *str, size_t len,
int bin)
{
return write_bytes_to_file_impl(fname, str, len,
OPEN_FLAGS_DONT_REPLACE|
(bin?O_BINARY:O_TEXT));
} }
/** Read the contents of <b>filename</b> into a newly allocated /** Read the contents of <b>filename</b> into a newly allocated

3
src/common/util.h
View File

@ -315,6 +315,7 @@ int check_private_dir(const char *dirname, cpd_check_t check,
const char *effective_user); const char *effective_user);
#define OPEN_FLAGS_REPLACE (O_WRONLY|O_CREAT|O_TRUNC) #define OPEN_FLAGS_REPLACE (O_WRONLY|O_CREAT|O_TRUNC)
#define OPEN_FLAGS_APPEND (O_WRONLY|O_CREAT|O_APPEND) #define OPEN_FLAGS_APPEND (O_WRONLY|O_CREAT|O_APPEND)
#define OPEN_FLAGS_DONT_REPLACE (O_CREAT|O_EXCL|O_APPEND|O_WRONLY)
typedef struct open_file_t open_file_t; typedef struct open_file_t open_file_t;
int start_writing_to_file(const char *fname, int open_flags, int mode, int start_writing_to_file(const char *fname, int open_flags, int mode,
open_file_t **data_out); open_file_t **data_out);
@ -336,6 +337,8 @@ int write_chunks_to_file(const char *fname, const struct smartlist_t *chunks,
int bin); int bin);
int append_bytes_to_file(const char *fname, const char *str, size_t len, int append_bytes_to_file(const char *fname, const char *str, size_t len,
int bin); int bin);
int write_bytes_to_new_file(const char *fname, const char *str, size_t len,
int bin);
/** Flag for read_file_to_str: open the file in binary mode. */ /** Flag for read_file_to_str: open the file in binary mode. */
#define RFTS_BIN 1 #define RFTS_BIN 1