#include "str.h"
#include <ctype.h>
-#include <limits.h>
+#include <errno.h>
+#include <stdint.h>
#include <stdlib.h>
-#include <libpspp/alloc.h>
#include <libpspp/message.h>
#include <libpspp/pool.h>
+#include <relocatable.h>
#include "minmax.h"
-#include "size_max.h"
+#include "xalloc.h"
#include "xsize.h"
\f
/* Reverses the order of NBYTES bytes at address P, thus converting
*s = tolower ((unsigned char) *s);
}
+/* Converts NUMBER into a string in 26-adic notation in BUFFER,
+ which has room for SIZE bytes. Returns true if successful,
+ false if NUMBER, plus a trailing null, is too large to fit in
+ the available space.
+
+ 26-adic notation is "spreadsheet column numbering": 1 = A, 2 =
+ B, 3 = C, ... 26 = Z, 27 = AA, 28 = AB, 29 = AC, ...
+
+ 26-adic notation is the special case of a k-adic numeration
+ system (aka bijective base-k numeration) with k=26. In k-adic
+ numeration, the digits are {1, 2, 3, ..., k} (there is no
+ digit 0), and integer 0 is represented by the empty string.
+ For more information, see
+ http://en.wikipedia.org/wiki/Bijective_numeration. */
+bool
+str_format_26adic (unsigned long int number, char buffer[], size_t size)
+{
+ size_t length = 0;
+
+ while (number-- > 0)
+ {
+ if (length >= size)
+ return false;
+ buffer[length++] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"[number % 26];
+ number /= 26;
+ }
+
+ if (length >= size)
+ return false;
+ buffer[length] = '\0';
+
+ buf_reverse (buffer, length);
+ return true;
+}
+
/* Formats FORMAT into DST, as with sprintf(), and returns the
address of the terminating null written to DST. */
char *
return false;
}
+/* If the first character in SS is in MATCH, removes it and
+ returns the character that was removed.
+ Otherwise, returns EOF without changing the string. */
+int
+ss_match_char_in (struct substring *ss, struct substring match)
+{
+ int c = EOF;
+ if (ss->length > 0
+ && memchr (match.string, ss->string[0], match.length) != NULL)
+ {
+ c = ss->string[0];
+ ss->string++;
+ ss->length--;
+ }
+ return c;
+}
+
/* If SS begins with TARGET, removes it and returns true.
Otherwise, returns false without changing SS. */
bool
return st->ss.string;
}
-/* Appends to ST a newline-terminated line read from STREAM.
- Newline is the last character of ST on return, unless an I/O error
- or end of file is encountered after reading some characters.
- Returns true if a line is successfully read, false if no characters at
- all were read before an I/O error or end of file was
- encountered. */
+/* Appends to ST a newline-terminated line read from STREAM, but
+ no more than MAX_LENGTH characters.
+ Newline is the last character of ST on return, if encountering
+ a newline was the reason for terminating.
+ Returns true if at least one character was read from STREAM
+ and appended to ST, false if no characters at all were read
+ before an I/O error or end of file was encountered (or
+ MAX_LENGTH was 0). */
bool
-ds_read_line (struct string *st, FILE *stream)
+ds_read_line (struct string *st, FILE *stream, size_t max_length)
{
- int c;
+ if (!st->ss.length && max_length == SIZE_MAX)
+ {
+ size_t capacity = st->capacity ? st->capacity + 1 : 0;
+ ssize_t n = getline (&st->ss.string, &capacity, stream);
+ if (capacity)
+ st->capacity = capacity - 1;
+ if (n > 0)
+ {
+ st->ss.length = n;
+ return true;
+ }
+ else
+ return false;
+ }
+ else
+ {
+ size_t length;
- c = getc (stream);
- if (c == EOF)
- return false;
+ for (length = 0; length < max_length; length++)
+ {
+ int c = getc (stream);
+ if (c == EOF)
+ break;
- for (;;)
- {
- ds_put_char (st, c);
- if (c == '\n')
- return true;
+ ds_put_char (st, c);
+ if (c == '\n')
+ return true;
+ }
- c = getc (stream);
- if (c == EOF)
- return true;
+ return length > 0;
}
}
ds_clear (st);
do
{
- if (!ds_read_line (st, stream))
+ if (!ds_read_line (st, stream, SIZE_MAX))
return false;
(*line_number)++;
ds_rtrim (st, ss_cstr (CC_SPACES));
/* Attempts to read SIZE * CNT bytes from STREAM and append them
to ST.
- Returns number of bytes actually read. */
-size_t
+ Returns true if all the requested data was read, false otherwise. */
+bool
ds_read_stream (struct string *st, size_t size, size_t cnt, FILE *stream)
{
if (size != 0)
if (size_in_bounds_p (xsum (ds_length (st), try_bytes)))
{
char *buffer = ds_put_uninit (st, try_bytes);
- size_t got_bytes = fread (buffer, size, cnt, stream);
+ size_t got_bytes = fread (buffer, 1, try_bytes, stream);
ds_truncate (st, ds_length (st) - (try_bytes - got_bytes));
- return got_bytes;
+ return got_bytes == try_bytes;
+ }
+ else
+ {
+ errno = ENOMEM;
+ return false;
}
}
- return 0;
+ else
+ return true;
}
/* Concatenates S onto ST. */
{
memset (ds_put_uninit (st, cnt), ch, cnt);
}
+
+
+/* If relocation has been enabled, replace ST,
+ with its relocated version */
+void
+ds_relocate (struct string *st)
+{
+ const char *orig = ds_cstr (st);
+ const char *rel = relocate (orig);
+
+ if ( orig != rel)
+ {
+ ds_clear (st);
+ ds_put_cstr (st, rel);
+ free ((char *) rel);
+ }
+}