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author | Akim Demaille <akim.demaille@gmail.com> | 2019-09-21 08:28:56 +0200 |
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committer | Akim Demaille <akim.demaille@gmail.com> | 2019-09-22 09:12:08 +0200 |
commit | 67bff62e315f7589145cf2a361151bb23293a55d (patch) | |
tree | 928fc4b304e862a5ad278a7cdf5cda2bb7cdf7c5 /src/location.c | |
parent | 5f45cb05f11031ded8ffb6355bf91b900da37f54 (diff) | |
download | bison-67bff62e315f7589145cf2a361151bb23293a55d.tar.gz |
diagnostics: get the screen width from the terminal
* bootstrap.conf: We need winsz-ioctl and winsz-termios.
* src/location.c (columns): Use winsize to get the number of
columns.
Code taken from the GNU Coreutils.
* src/location.h, src/location.c (caret_init): New.
* src/complain.c (complain_init): Call it.
* tests/bison.in: Export COLUMNS so that users of tests/bison can
enjoy proper line truncation.
Diffstat (limited to 'src/location.c')
-rw-r--r-- | src/location.c | 50 |
1 files changed, 40 insertions, 10 deletions
diff --git a/src/location.c b/src/location.c index a7824557..bb2592f9 100644 --- a/src/location.c +++ b/src/location.c @@ -25,7 +25,14 @@ #include <mbswidth.h> #include <quotearg.h> #include <stdio.h> /* fileno */ +#include <sys/ioctl.h> #include <sys/stat.h> /* fstat */ +#include <termios.h> + +#ifdef WINSIZE_IN_PTEM +# include <sys/stream.h> +# include <sys/ptem.h> +#endif #include "complain.h" #include "getargs.h" @@ -39,7 +46,13 @@ min_int (int a, int b) return a < b ? a : b; } -/* The terminal width. */ +static int +max_int (int a, int b) +{ + return a >= b ? a : b; +} + +/* The terminal width. Not less than 40. */ static int columns (void) { @@ -50,9 +63,21 @@ columns (void) unsigned long ul = strtoul (cp, NULL, 10); res = ul < INT_MAX ? ul : INT_MAX; } - return res; + else + { +#ifdef TIOCGWINSZ + struct winsize ws; + if (ioctl (STDERR_FILENO, TIOCGWINSZ, &ws) != -1 + && 0 < ws.ws_col && ws.ws_col == (size_t) ws.ws_col) + res = ws.ws_col; +#endif + } + return max_int (res, 40); } +/* Available screen width. */ +static int screen_width = 80; + /* If BUF is null, add BUFSIZE (which in this case must be less than INT_MAX) to COLUMN; otherwise, add mbsnwidth (BUF, BUFSIZE, 0) to COLUMN. If an overflow occurs, return INT_MAX. */ @@ -235,6 +260,11 @@ caret_set_file (const char *file) return caret_info.file; } +void caret_init (void) +{ + screen_width = columns (); +} + void caret_free (void) { @@ -308,10 +338,17 @@ location_caret (location loc, const char *style, FILE *out) boundary_compute (&caret_info.pos, mb_ptr (c), mb_len (c)); } int line_len = caret_info.pos.column; + /* Go back to the beginning of line. */ + fseek (caret_info.file, caret_info.offset, SEEK_SET); + /* Reset mbf's internal state. + FIXME: should be done in mbfile. */ + caret_info.mbfile.eof_seen = 0; + caret_info.pos.column = 1; + /* Available width. Eight chars are consumed by the left-margin of the quoting lines. */ - int width = columns () - 8; + int width = screen_width - 8; int skip = 0; if (width < line_len) { @@ -327,13 +364,6 @@ location_caret (location loc, const char *style, FILE *out) if (width < line_len - skip) width -= 3; - /* Go back to the beginning of line. */ - fseek (caret_info.file, caret_info.offset, SEEK_SET); - /* Reset mbf's internal state. - FIXME: should be done in mbfile. */ - caret_info.mbfile.eof_seen = 0; - caret_info.pos.column = 1; - /* Read the actual line. Don't update the offset, so that we keep a pointer to the start of the line. */ { |