return Qnil;
}
-/* Check quit and read from the file. STATE is a Lisp_Save_Value
+/* Read from a non-regular file. STATE is a Lisp_Save_Value
object where slot 0 is the file descriptor, slot 1 specifies
an offset to put the read bytes, and slot 2 is the maximum
amount of bytes to read. Value is the number of bytes read. */
static Lisp_Object
-read_contents (Lisp_Object state)
+read_non_regular (Lisp_Object state)
{
int nbytes;
return make_number (nbytes);
}
-/* Condition-case handler used when reading files in insert-file-contents. */
+
+/* Condition-case handler used when reading from non-regular files
+ in insert-file-contents. */
static Lisp_Object
-read_contents_quit (Lisp_Object ignore)
+read_non_regular_quit (Lisp_Object ignore)
{
return Qnil;
}
Lisp_Object p;
ptrdiff_t total = 0;
bool not_regular = 0;
- int save_errno = 0, read_errno = 0;
+ int save_errno = 0;
char read_buf[READ_BUF_SIZE];
struct coding_system coding;
- char buffer[1 << 14];
bool replace_handled = 0;
bool set_coding_system = 0;
Lisp_Object coding_system;
{
int nread, bufpos;
- nread = emacs_read (fd, buffer, sizeof buffer);
+ nread = emacs_read (fd, read_buf, sizeof read_buf);
if (nread < 0)
error ("IO error reading %s: %s",
SSDATA (orig_filename), emacs_strerror (errno));
if (CODING_REQUIRE_DETECTION (&coding))
{
- coding_system = detect_coding_system ((unsigned char *) buffer,
+ coding_system = detect_coding_system ((unsigned char *) read_buf,
nread, nread, 1, 0,
coding_system);
setup_coding_system (coding_system, &coding);
bufpos = 0;
while (bufpos < nread && same_at_start < ZV_BYTE
- && FETCH_BYTE (same_at_start) == buffer[bufpos])
+ && FETCH_BYTE (same_at_start) == read_buf[bufpos])
same_at_start++, bufpos++;
/* If we found a discrepancy, stop the scan.
Otherwise loop around and scan the next bufferful. */
if (curpos == 0)
break;
/* How much can we scan in the next step? */
- trial = min (curpos, sizeof buffer);
+ trial = min (curpos, sizeof read_buf);
if (lseek (fd, curpos - trial, SEEK_SET) < 0)
report_file_error ("Setting file position",
Fcons (orig_filename, Qnil));
total_read = nread = 0;
while (total_read < trial)
{
- nread = emacs_read (fd, buffer + total_read, trial - total_read);
+ nread = emacs_read (fd, read_buf + total_read, trial - total_read);
if (nread < 0)
error ("IO error reading %s: %s",
SDATA (orig_filename), emacs_strerror (errno));
/* Compare with same_at_start to avoid counting some buffer text
as matching both at the file's beginning and at the end. */
while (bufpos > 0 && same_at_end > same_at_start
- && FETCH_BYTE (same_at_end - 1) == buffer[bufpos - 1])
+ && FETCH_BYTE (same_at_end - 1) == read_buf[bufpos - 1])
same_at_end--, bufpos--;
/* If we found a discrepancy, stop the scan.
Fcons (orig_filename, Qnil));
}
- /* In the following loop, HOW_MUCH contains the total bytes read
- so far for a regular file, and not changed for a special file. */
+ /* In the following loop, HOW_MUCH contains the total bytes read so
+ far for a regular file, and not changed for a special file. But,
+ before exiting the loop, it is set to a negative value if I/O
+ error occurs. */
how_much = 0;
/* Total bytes inserted. */
inserted = 0;
- /* Here we don't do code conversion in the loop. It is done by
- decode_coding_gap after all data are read into the buffer, or
- reading loop is interrupted with quit or due to I/O error. */
+ /* Here, we don't do code conversion in the loop. It is done by
+ decode_coding_gap after all data are read into the buffer. */
+ {
+ ptrdiff_t gap_size = GAP_SIZE;
- while (how_much < total)
- {
- ptrdiff_t nread, maxread = min (total - how_much, READ_BUF_SIZE);
- Lisp_Object result;
-
- /* For a special file, gap is enlarged as we read,
- so GAP_SIZE should be checked every time. */
- if (not_regular && (GAP_SIZE < maxread))
- make_gap (maxread - GAP_SIZE);
-
- /* Read from the file, capturing `quit'. */
- result = internal_condition_case_1
- (read_contents,
- make_save_value ("iii", (ptrdiff_t) fd, inserted, maxread),
- Qerror, read_contents_quit);
- if (NILP (result))
- {
- /* Quit is signaled. End the loop and arrange
- real quit after decoding the text we read. */
- read_quit = 1;
- break;
- }
- nread = XINT (result);
- if (nread <= 0)
- {
- /* End of file or I/O error. End the loop and
- save error code in case of I/O error. */
- if (nread < 0)
- read_errno = errno;
- break;
- }
+ while (how_much < total)
+ {
+ /* try is reserved in some compilers (Microsoft C) */
+ ptrdiff_t trytry = min (total - how_much, READ_BUF_SIZE);
+ ptrdiff_t this;
- /* Adjust gap and end positions. */
- GAP_SIZE -= nread;
- GPT += nread;
- ZV += nread;
- Z += nread;
- GPT_BYTE += nread;
- ZV_BYTE += nread;
- Z_BYTE += nread;
- if (GAP_SIZE > 0)
- *(GPT_ADDR) = 0;
-
- /* For a regular file, where TOTAL is the real size, count HOW_MUCH to
- compare with it. For a special file, where TOTAL is just a buffer
- size, don't bother counting in HOW_MUCH, but always accumulate the
- number of bytes read in INSERTED. */
- if (!not_regular)
- how_much += nread;
- inserted += nread;
- }
+ if (not_regular)
+ {
+ Lisp_Object nbytes;
+
+ /* Maybe make more room. */
+ if (gap_size < trytry)
+ {
+ make_gap (trytry - gap_size);
+ gap_size = GAP_SIZE - inserted;
+ }
+
+ /* Read from the file, capturing `quit'. When an
+ error occurs, end the loop, and arrange for a quit
+ to be signaled after decoding the text we read. */
+ nbytes = internal_condition_case_1
+ (read_non_regular,
+ make_save_value ("iii", (ptrdiff_t) fd, inserted, trytry),
+ Qerror, read_non_regular_quit);
+
+ if (NILP (nbytes))
+ {
+ read_quit = 1;
+ break;
+ }
+
+ this = XINT (nbytes);
+ }
+ else
+ {
+ /* Allow quitting out of the actual I/O. We don't make text
+ part of the buffer until all the reading is done, so a C-g
+ here doesn't do any harm. */
+ immediate_quit = 1;
+ QUIT;
+ this = emacs_read (fd,
+ ((char *) BEG_ADDR + PT_BYTE - BEG_BYTE
+ + inserted),
+ trytry);
+ immediate_quit = 0;
+ }
+
+ if (this <= 0)
+ {
+ how_much = this;
+ break;
+ }
+
+ gap_size -= this;
+
+ /* For a regular file, where TOTAL is the real size,
+ count HOW_MUCH to compare with it.
+ For a special file, where TOTAL is just a buffer size,
+ so don't bother counting in HOW_MUCH.
+ (INSERTED is where we count the number of characters inserted.) */
+ if (! not_regular)
+ how_much += this;
+ inserted += this;
+ }
+ }
/* Now we have either read all the file data into the gap,
or stop reading on I/O error or quit. If nothing was
/* Discard the unwind protect for closing the file. */
specpdl_ptr--;
+ if (how_much < 0)
+ error ("IO error reading %s: %s",
+ SDATA (orig_filename), emacs_strerror (errno));
+
+ /* Make the text read part of the buffer. */
+ GAP_SIZE -= inserted;
+ GPT += inserted;
+ GPT_BYTE += inserted;
+ ZV += inserted;
+ ZV_BYTE += inserted;
+ Z += inserted;
+ Z_BYTE += inserted;
+
+ if (GAP_SIZE > 0)
+ /* Put an anchor to ensure multi-byte form ends at gap. */
+ *GPT_ADDR = 0;
+
notfound:
if (NILP (coding_system))
report_file_error ("Opening input file", Fcons (orig_filename, Qnil));
}
- /* There was an error reading file. */
- if (read_errno)
- error ("IO error reading %s: %s",
- SDATA (orig_filename), emacs_strerror (read_errno));
-
- /* Quit was signaled. */
if (read_quit)
Fsignal (Qquit, Qnil);
+ /* Retval needs to be dealt with in all cases consistently. */
if (NILP (val))
val = list2 (orig_filename, make_number (inserted));
projects / emacs.git / commitdiff