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77da20196f
The "size" member was confusing - it's the size of the allocation, not the size of the current string. The size of the current string is the member called "used". This naming makes perfect sense for the internal implementation, but it's confusing to users who actually do want to get the size of the resulting string at the end. So rename the fields to "alloc" and "len" - which is pretty clear. This also adds a helper function to strip whitespace from the end: "strip_mb()". Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
63 lines
2 KiB
C
63 lines
2 KiB
C
#ifndef MEMBUFFER_H
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#define MEMBUFFER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <ctype.h>
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struct membuffer {
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unsigned int len, alloc;
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char *buffer;
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};
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#ifdef __GNUC__
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#define __printf(x,y) __attribute__ ((__format__ (__printf__, x, y)))
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#else
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#define __printf(x,y)
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#endif
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extern void free_buffer(struct membuffer *);
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extern void flush_buffer(struct membuffer *, FILE *);
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extern void put_bytes(struct membuffer *, const char *, int);
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extern void put_string(struct membuffer *, const char *);
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extern void strip_mb(struct membuffer *);
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extern __printf(2,0) void put_vformat(struct membuffer *, const char *, va_list);
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extern __printf(2,3) void put_format(struct membuffer *, const char *fmt, ...);
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/* Output one of our "milli" values with type and pre/post data */
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extern void put_milli(struct membuffer *, const char *, int, const char *);
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/*
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* Helper functions for showing particular types. If the type
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* is empty, nothing is done, and the function returns false.
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* Otherwise, it returns true.
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*
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* The two "const char *" at the end are pre/post data.
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*
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* The reason for the pre/post data is so that you can easily
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* prepend and append a string without having to test whether the
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* type is empty. So
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*
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* put_temperature(b, temp, "Temp=", " C\n");
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*
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* writes nothing to the buffer if there is no temperature data,
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* but otherwise would a string that looks something like
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*
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* "Temp=28.1 C\n"
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*
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* to the memory buffer (typically the post/pre will be some XML
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* pattern and unit string or whatever).
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*/
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extern int put_temperature(struct membuffer *, temperature_t, const char *, const char *);
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extern int put_depth(struct membuffer *, depth_t, const char *, const char *);
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extern int put_duration(struct membuffer *, duration_t, const char *, const char *);
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extern int put_pressure(struct membuffer *, pressure_t, const char *, const char *);
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extern int put_salinity(struct membuffer *, int, const char *, const char *);
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#ifdef __cplusplus
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}
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#endif
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#endif
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