\f
char buf[128];
-/* Add CH to either outfile, if PRINTFLAG is positive, or to the buffer
- whose end is pointed to by BUFP, if PRINTFLAG is negative.
- If the counters pointed to by PENDING_NEWLINES and PENDING_SPACES are
- non-zero, that many newlines and spaces are output before CH, and
- the counters are zeroed. */
+/* Some state during the execution of `read_c_string_or_comment'. */
+struct rcsoc_state
+{
+ /* A count of spaces and newlines that have been read, but not output. */
+ unsigned pending_spaces, pending_newlines;
+
+ /* Where we're reading from. */
+ FILE *in_file;
+
+ /* If non-zero, a buffer into which to copy characters. */
+ char *buf_ptr;
+ /* If non-zero, a file into which to copy characters. */
+ FILE *out_file;
+
+ /* A keyword we look for at the beginning of lines. If found, it is
+ not copied, and SAW_KEYWORD is set to true. */
+ char *keyword;
+ /* The current point we've reached in an occurance of KEYWORD in
+ the input stream. */
+ char *cur_keyword_ptr;
+ /* Set to true if we saw an occurance of KEYWORD. */
+ int saw_keyword;
+};
+
+/* Output CH to the file or buffer in STATE. Any pending newlines or
+ spaces are output first. */
static INLINE void
-put_char (ch, printflag, bufp, pending_newlines, pending_spaces)
- int ch, printflag;
- char **bufp;
- unsigned *pending_newlines, *pending_spaces;
+put_char (ch, state)
+ int ch;
+ struct rcsoc_state *state;
{
int out_ch;
do
{
- if (*pending_newlines > 0)
+ if (state->pending_newlines > 0)
{
- (*pending_newlines)--;
+ state->pending_newlines--;
out_ch = '\n';
}
- else if (*pending_spaces > 0)
+ else if (state->pending_spaces > 0)
{
- (*pending_spaces)--;
+ state->pending_spaces--;
out_ch = ' ';
}
else
out_ch = ch;
- if (printflag > 0)
- putc (out_ch, outfile);
- else if (printflag < 0)
- *(*bufp)++ = out_ch;
+ if (state->out_file)
+ putc (out_ch, state->out_file);
+ if (state->buf_ptr)
+ *state->buf_ptr++ = out_ch;
}
while (out_ch != ch);
}
+/* If in the middle of scanning a keyword, continue scanning with
+ character CH, otherwise output CH to the file or buffer in STATE.
+ Any pending newlines or spaces are output first, as well as any
+ previously scanned characters that were thought to be part of a
+ keyword, but were in fact not. */
+
+static void
+scan_keyword_or_put_char (ch, state)
+ int ch;
+ struct rcsoc_state *state;
+{
+ if (state->keyword
+ && *state->cur_keyword_ptr == ch
+ && (state->cur_keyword_ptr > state->keyword
+ || state->pending_newlines > 0))
+ /* We might be looking at STATE->keyword at some point.
+ Keep looking until we know for sure. */
+ {
+ if (*++state->cur_keyword_ptr == '\0')
+ /* Saw the whole keyword. Set SAW_KEYWORD flag to true. */
+ {
+ state->saw_keyword = 1;
+
+ /* Reset the scanning pointer. */
+ state->cur_keyword_ptr = state->keyword;
+
+ /* Canonicalize whitespace preceding a usage string. */
+ state->pending_newlines = 2;
+ state->pending_spaces = 0;
+
+ /* Skip any whitespace between the keyword and the
+ usage string. */
+ do
+ ch = getc (state->in_file);
+ while (ch == ' ' || ch == '\n');
+
+ /* Put back the non-whitespace character. */
+ ungetc (ch, state->in_file);
+ }
+ }
+ else
+ {
+ if (state->keyword && state->cur_keyword_ptr > state->keyword)
+ /* We scanned the beginning of a potential usage
+ keyword, but it was a false alarm. Output the
+ part we scanned. */
+ {
+ char *p;
+
+ for (p = state->keyword; p < state->cur_keyword_ptr; p++)
+ put_char (*p, state);
+
+ state->cur_keyword_ptr = state->keyword;
+ }
+
+ put_char (ch, state);
+ }
+}
+
+
/* Skip a C string or C-style comment from INFILE, and return the
character that follows. COMMENT non-zero means skip a comment. If
PRINTFLAG is positive, output string contents to outfile. If it is
int *saw_usage;
{
register int c;
- unsigned pending_spaces = 0, pending_newlines = 0;
- char *p = buf;
- /* When this keyword occurs at the beginning of a line, we remove it,
- and set *SAW_USAGE to true. */
- static char usage_keyword[] = "usage:";
- /* The current point we've reached in an occurance of USAGE_KEYWORD in
- the input stream. */
- char *cur_usage_ptr = usage_keyword;
-
+ struct rcsoc_state state;
+
+ state.in_file = infile;
+ state.buf_ptr = (printflag < 0 ? buf : 0);
+ state.out_file = (printflag > 0 ? outfile : 0);
+ state.pending_spaces = 0;
+ state.pending_newlines = 0;
+ state.keyword = (saw_usage ? "usage:" : 0);
+ state.cur_keyword_ptr = state.keyword;
+ state.saw_keyword = 0;
+
+ c = getc (infile);
if (comment)
- {
- while ((c = getc (infile)) != EOF
- && (c == '\n' || c == '\r' || c == '\t' || c == ' '))
- ;
- }
- else
- c = getc (infile);
-
- if (saw_usage)
- *saw_usage = 0;
+ while (c == '\n' || c == '\r' || c == '\t' || c == ' ')
+ c = getc (infile);
while (c != EOF)
{
}
if (c == ' ')
- pending_spaces++;
+ state.pending_spaces++;
else if (c == '\n')
{
- pending_newlines++;
- pending_spaces = 0;
+ state.pending_newlines++;
+ state.pending_spaces = 0;
}
else
- {
- if (saw_usage
- && *cur_usage_ptr == c
- && (cur_usage_ptr > usage_keyword || pending_newlines > 0))
- /* We might be looking at USAGE_KEYWORD at some point.
- Keep looking until we know for sure. */
- {
- if (*++cur_usage_ptr == '\0')
- /* Saw the whole keyword. Set *SAW_USAGE to true. */
- {
- *saw_usage = 1;
-
- /* Reset the scanning pointer. */
- cur_usage_ptr = usage_keyword;
-
- /* Canonicalize whitespace preceding a usage string. */
- pending_newlines = 2;
- pending_spaces = 0;
-
- /* Skip any whitespace between the keyword and the
- usage string. */
- do
- c = getc (infile);
- while (c == ' ' || c == '\n');
-
- continue; /* This just skips the getc at end-of-loop. */
- }
- }
- else
- {
- if (cur_usage_ptr > usage_keyword)
- /* We scanned the beginning of a potential usage
- keyword, but it was a false alarm. Output the
- part we scanned. */
- {
- char *p;
- for (p = usage_keyword; p < cur_usage_ptr; p++)
- put_char (*p, printflag, &p,
- &pending_newlines, &pending_spaces);
- cur_usage_ptr = usage_keyword;
- }
-
- put_char (c, printflag, &p,
- &pending_newlines, &pending_spaces);
- }
- }
+ scan_keyword_or_put_char (c, &state);
c = getc (infile);
}
break;
}
- put_char ('*', printflag, &p, &pending_newlines, &pending_spaces);
+ scan_keyword_or_put_char ('*', &state);
}
else
{
}
if (printflag < 0)
- *p = 0;
+ *state.buf_ptr = 0;
+
+ if (saw_usage)
+ *saw_usage = state.saw_keyword;
return c;
}
HCoop / bpt / emacs.git / commitdiff