projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | # ifndef EC_H |
| 2 | # define EC_H | |
| 3 | ||
| 4 | # ifndef CORD_H | |
| 5 | # include "cord.h" | |
| 6 | # endif | |
| 7 | ||
| 8 | /* Extensible cords are strings that may be destructively appended to. */ | |
| 9 | /* They allow fast construction of cords from characters that are */ | |
| 10 | /* being read from a stream. */ | |
| 11 | /* | |
| 12 | * A client might look like: | |
| 13 | * | |
| 14 | * { | |
| 15 | * CORD_ec x; | |
| 16 | * CORD result; | |
| 17 | * char c; | |
| 18 | * FILE *f; | |
| 19 | * | |
| 20 | * ... | |
| 21 | * CORD_ec_init(x); | |
| 22 | * while(...) { | |
| 23 | * c = getc(f); | |
| 24 | * ... | |
| 25 | * CORD_ec_append(x, c); | |
| 26 | * } | |
| 27 | * result = CORD_balance(CORD_ec_to_cord(x)); | |
| 28 | * | |
| 29 | * If a C string is desired as the final result, the call to CORD_balance | |
| 30 | * may be replaced by a call to CORD_to_char_star. | |
| 31 | */ | |
| 32 | ||
| 33 | # ifndef CORD_BUFSZ | |
| 34 | # define CORD_BUFSZ 128 | |
| 35 | # endif | |
| 36 | ||
| 37 | typedef struct CORD_ec_struct { | |
| 38 | CORD ec_cord; | |
| 39 | char * ec_bufptr; | |
| 40 | char ec_buf[CORD_BUFSZ+1]; | |
| 41 | } CORD_ec[1]; | |
| 42 | ||
| 43 | /* This structure represents the concatenation of ec_cord with */ | |
| 44 | /* ec_buf[0 ... (ec_bufptr-ec_buf-1)] */ | |
| 45 | ||
| 46 | /* Flush the buffer part of the extended chord into ec_cord. */ | |
| 47 | /* Note that this is almost the only real function, and it is */ | |
| 48 | /* implemented in 6 lines in cordxtra.c */ | |
| 49 | void CORD_ec_flush_buf(CORD_ec x); | |
| 50 | ||
| 51 | /* Convert an extensible cord to a cord. */ | |
| 52 | # define CORD_ec_to_cord(x) (CORD_ec_flush_buf(x), (x)[0].ec_cord) | |
| 53 | ||
| 54 | /* Initialize an extensible cord. */ | |
| 55 | # define CORD_ec_init(x) ((x)[0].ec_cord = 0, (x)[0].ec_bufptr = (x)[0].ec_buf) | |
| 56 | ||
| 57 | /* Append a character to an extensible cord. */ | |
| 58 | # define CORD_ec_append(x, c) \ | |
| 59 | { \ | |
| 60 | if ((x)[0].ec_bufptr == (x)[0].ec_buf + CORD_BUFSZ) { \ | |
| 61 | CORD_ec_flush_buf(x); \ | |
| 62 | } \ | |
| 63 | *((x)[0].ec_bufptr)++ = (c); \ | |
| 64 | } | |
| 65 | ||
| 66 | /* Append a cord to an extensible cord. Structure remains shared with */ | |
| 67 | /* original. */ | |
| 68 | void CORD_ec_append_cord(CORD_ec x, CORD s); | |
| 69 | ||
| 70 | # endif /* EC_H */ |