diff options
Diffstat (limited to 'lib/dynamic-string.c')
| -rw-r--r-- | lib/dynamic-string.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/lib/dynamic-string.c b/lib/dynamic-string.c new file mode 100644 index 000000000..6214c8a10 --- /dev/null +++ b/lib/dynamic-string.c @@ -0,0 +1,261 @@ +/* + * Copyright (c) 2008 Nicira Networks. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <config.h> +#include "dynamic-string.h" +#include <assert.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include "timeval.h" +#include "util.h" + +void +ds_init(struct ds *ds) +{ + ds->string = NULL; + ds->length = 0; + ds->allocated = 0; +} + +void +ds_clear(struct ds *ds) +{ + ds->length = 0; +} + +void +ds_truncate(struct ds *ds, size_t new_length) +{ + if (ds->length > new_length) { + ds->length = new_length; + ds->string[new_length] = '\0'; + } +} + +void +ds_reserve(struct ds *ds, size_t min_length) +{ + if (min_length > ds->allocated || !ds->string) { + ds->allocated += MAX(min_length, ds->allocated); + ds->allocated = MAX(8, ds->allocated); + ds->string = xrealloc(ds->string, ds->allocated + 1); + } +} + +char * +ds_put_uninit(struct ds *ds, size_t n) +{ + ds_reserve(ds, ds->length + n); + ds->length += n; + ds->string[ds->length] = '\0'; + return &ds->string[ds->length - n]; +} + +void +ds_put_char(struct ds *ds, char c) +{ + *ds_put_uninit(ds, 1) = c; +} + +void +ds_put_char_multiple(struct ds *ds, char c, size_t n) +{ + memset(ds_put_uninit(ds, n), c, n); +} + +void +ds_put_buffer(struct ds *ds, const char *s, size_t n) +{ + memcpy(ds_put_uninit(ds, n), s, n); +} + +void +ds_put_cstr(struct ds *ds, const char *s) +{ + size_t s_len = strlen(s); + memcpy(ds_put_uninit(ds, s_len), s, s_len); +} + +void +ds_put_format(struct ds *ds, const char *format, ...) +{ + va_list args; + + va_start(args, format); + ds_put_format_valist(ds, format, args); + va_end(args); +} + +void +ds_put_format_valist(struct ds *ds, const char *format, va_list args_) +{ + va_list args; + size_t available; + int needed; + + va_copy(args, args_); + available = ds->string ? ds->allocated - ds->length + 1 : 0; + needed = vsnprintf(&ds->string[ds->length], available, format, args); + va_end(args); + + if (needed < available) { + ds->length += needed; + } else { + size_t available; + + ds_reserve(ds, ds->length + needed); + + va_copy(args, args_); + available = ds->allocated - ds->length + 1; + needed = vsnprintf(&ds->string[ds->length], available, format, args); + va_end(args); + + assert(needed < available); + ds->length += needed; + } +} + +void +ds_put_printable(struct ds *ds, const char *s, size_t n) +{ + ds_reserve(ds, ds->length + n); + while (n-- > 0) { + unsigned char c = *s++; + if (c < 0x20 || c > 0x7e || c == '\\' || c == '"') { + ds_put_format(ds, "\\%03o", (int) c); + } else { + ds_put_char(ds, c); + } + } +} + +void +ds_put_strftime(struct ds *ds, const char *template, const struct tm *tm) +{ + if (!tm) { + time_t now = time_now(); + tm = localtime(&now); + } + for (;;) { + size_t avail = ds->string ? ds->allocated - ds->length + 1 : 0; + size_t used = strftime(&ds->string[ds->length], avail, template, tm); + if (used) { + ds->length += used; + return; + } + ds_reserve(ds, ds->length + (avail < 32 ? 64 : 2 * avail)); + } +} + +int +ds_get_line(struct ds *ds, FILE *file) +{ + ds_clear(ds); + for (;;) { + int c = getc(file); + if (c == EOF) { + return ds->length ? 0 : EOF; + } else if (c == '\n') { + return 0; + } else { + ds_put_char(ds, c); + } + } +} + +char * +ds_cstr(struct ds *ds) +{ + if (!ds->string) { + ds_reserve(ds, 0); + } + ds->string[ds->length] = '\0'; + return ds->string; +} + +void +ds_destroy(struct ds *ds) +{ + free(ds->string); +} + +/* Writes the 'size' bytes in 'buf' to 'string' as hex bytes arranged 16 per + * line. Numeric offsets are also included, starting at 'ofs' for the first + * byte in 'buf'. If 'ascii' is true then the corresponding ASCII characters + * are also rendered alongside. */ +void +ds_put_hex_dump(struct ds *ds, const void *buf_, size_t size, + uintptr_t ofs, bool ascii) +{ + const uint8_t *buf = buf_; + const size_t per_line = 16; /* Maximum bytes per line. */ + + while (size > 0) + { + size_t start, end, n; + size_t i; + + /* Number of bytes on this line. */ + start = ofs % per_line; + end = per_line; + if (end - start > size) + end = start + size; + n = end - start; + + /* Print line. */ + ds_put_format(ds, "%08jx ", (uintmax_t) ROUND_DOWN(ofs, per_line)); + for (i = 0; i < start; i++) + ds_put_format(ds, " "); + for (; i < end; i++) + ds_put_format(ds, "%02hhx%c", + buf[i - start], i == per_line / 2 - 1? '-' : ' '); + if (ascii) + { + for (; i < per_line; i++) + ds_put_format(ds, " "); + ds_put_format(ds, "|"); + for (i = 0; i < start; i++) + ds_put_format(ds, " "); + for (; i < end; i++) { + int c = buf[i - start]; + ds_put_char(ds, c >= 32 && c < 127 ? c : '.'); + } + for (; i < per_line; i++) + ds_put_format(ds, " "); + ds_put_format(ds, "|"); + } + ds_put_format(ds, "\n"); + + ofs += n; + buf += n; + size -= n; + } +} + +int +ds_last(const struct ds *ds) +{ + return ds->length > 0 ? (unsigned char) ds->string[ds->length - 1] : EOF; +} + +void +ds_chomp(struct ds *ds, int c) +{ + if (ds->length > 0 && ds->string[ds->length - 1] == (char) c) { + ds->string[--ds->length] = '\0'; + } +} |