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Add more C comments to entab.c.

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This commit is contained in:
Bruce Momjian 2014-01-29 12:22:12 -05:00
parent 25b1dafab6
commit db90bcf8df
1 changed files with 28 additions and 5 deletions
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33
src/tools/entab/entab.c
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@ -27,6 +27,7 @@
extern char *optarg;
extern int optind;
int
main(int argc, char **argv)
{
@ -88,6 +89,7 @@ main(int argc, char **argv)
argv += optind;
argc -= optind;
/* process arguments */
do
{
if (argc < 1)
@ -104,6 +106,7 @@ main(int argc, char **argv)
escaped = FALSE;
/* process lines */
while (fgets(in_line, sizeof(in_line), in_file) != NULL)
{
col_in_tab = 0;
@ -114,9 +117,11 @@ main(int argc, char **argv)
quote_char = ' ';
escaped = FALSE;
/* process line */
while (*src != NUL)
{
col_in_tab++;
/* Is this a potential space/tab replacement? */
if (quote_char == ' ' && (*src == ' ' || *src == '\t'))
{
if (*src == '\t')
@ -127,22 +132,26 @@ main(int argc, char **argv)
else
prv_spaces++;
/* Are we at a tab stop? */
if (col_in_tab == tab_size)
{
/*
* Is the next character going to be a tab? Needed to
* do tab replacement in current spot if next char is
* going to be a tab, ignoring min_spaces
* Is the next character going to be a tab? We do
* tab replacement in the current spot if the next
* char is going to be a tab and ignore min_spaces.
*/
nxt_spaces = 0;
while (1)
{
/* Have we reached non-whitespace? */
if (*(src + nxt_spaces + 1) == NUL ||
(*(src + nxt_spaces + 1) != ' ' &&
*(src + nxt_spaces + 1) != '\t'))
break;
/* count spaces */
if (*(src + nxt_spaces + 1) == ' ')
++nxt_spaces;
/* Have we found a forward tab? */
if (*(src + nxt_spaces + 1) == '\t' ||
nxt_spaces == tab_size)
{
@ -150,6 +159,7 @@ main(int argc, char **argv)
break;
}
}
/* Do tab replacment for spaces? */
if ((prv_spaces >= min_spaces ||
nxt_spaces == tab_size) &&
del_tabs == FALSE)
@ -158,40 +168,51 @@ main(int argc, char **argv)
prv_spaces = 0;
}
else
/* output accumulated spaces */
{
for (; prv_spaces > 0; prv_spaces--)
*(dst++) = ' ';
}
}
}
/* Not a potential space/tab replacement */
else
{
/* output accumulated spaces */
for (; prv_spaces > 0; prv_spaces--)
*(dst++) = ' ';
if (*src == '\t') /* only when in quote */
/* This can only happen in a quote. */
if (*src == '\t')
col_in_tab = 0;
/* visual backspace? */
if (*src == '\b')
col_in_tab -= 2;
/* Do we process quotes? */
if (escaped == FALSE && protect_quotes == TRUE)
{
if (*src == '\\')
escaped = TRUE;
/* Is this a quote character? */
if (*src == '"' || *src == '\'')
{
/* toggle quote mode */
if (quote_char == ' ')
quote_char = *src;
else if (*src == quote_char)
quote_char = ' ';
}
}
/* newlines/CRs do not terminate escapes */
else if (*src != '\r' && *src != '\n')
escaped = FALSE;
/* reached newline/CR; clip line? */
if ((*src == '\r' || *src == '\n') &&
quote_char == ' ' &&
clip_lines == TRUE &&
quote_char == ' ' &&
escaped == FALSE)
{
/* trim spaces starting from the end */
while (dst > out_line &&
(*(dst - 1) == ' ' || *(dst - 1) == '\t'))
dst--;
@ -210,9 +231,11 @@ main(int argc, char **argv)
dst--;
prv_spaces = 0;
}
/* output accumulated spaces */
for (; prv_spaces > 0; prv_spaces--)
*(dst++) = ' ';
*dst = NUL;
if (fputs(out_line, stdout) == EOF)
{
fprintf(stderr, "Cannot write to output file %s: %s\n", argv[0], strerror(errno));