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Save XML files into a memory buffer rather than directly into a file

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This introduces a "struct membuffer" abstraction that you can write
things into, and makes the XML saving code write to the memory buffer
rather than a file.

The UDDF export already really wanted this: it used to write to a file,
only to then read that file back into memory, delete the file, and then
*rewrite* the file after doing the magic xslt transform.

But the longer-term reason for this is that I want to try to write other
formats, and I want to try to share most helpers.  And those other
formats will need this memory buffer model.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Linus Torvalds 2014-01-16 09:03:11 +07:00 • committed by Dirk Hohndel
parent 2e08f75618
commit 96a4fd1bb2
6 changed files with 404 additions and 241 deletions
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52
membuffer.h Normal file
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#ifndef MEMBUFFER_H
#define MEMBUFFER_H
struct membuffer {
unsigned int size, used;
char *buffer;
};
#ifdef __GNUC__
#define __printf(x,y) __attribute__ ((__format__ (__printf__, x, y)))
#else
#define __printf(x,y)
#endif
extern void free_buffer(struct membuffer *);
extern void flush_buffer(struct membuffer *, FILE *);
extern void put_bytes(struct membuffer *, const char *, int);
extern void put_string(struct membuffer *, const char *);
extern __printf(2,0) void put_vformat(struct membuffer *, const char *, va_list);
extern __printf(2,3) void put_format(struct membuffer *, const char *fmt, ...);
/* Output one of our "milli" values with type and pre/post data */
extern void put_milli(struct membuffer *, const char *, int, const char *);
/*
* Helper functions for showing particular types. If the type
* is empty, nothing is done, and the function returns false.
* Otherwise, it returns true.
*
* The two "const char *" at the end are pre/post data.
*
* The reason for the pre/post data is so that you can easily
* prepend and append a string without having to test whether the
* type is empty. So
*
* put_temperature(b, temp, "Temp=", " C\n");
*
* writes nothing to the buffer if there is no temperature data,
* but otherwise would a string that looks something like
*
* "Temp=28.1 C\n"
*
* to the memory buffer (typically the post/pre will be some XML
* pattern and unit string or whatever).
*/
extern int put_temperature(struct membuffer *, temperature_t, const char *, const char *);
extern int put_depth(struct membuffer *, depth_t, const char *, const char *);
extern int put_duration(struct membuffer *, duration_t, const char *, const char *);
extern int put_pressure(struct membuffer *, pressure_t, const char *, const char *);
extern int put_salinity(struct membuffer *, int, const char *, const char *);
#endif