> Am 13.06.2025 um 00:14 schrieb Paul Eggert <egg...@cs.ucla.edu>:
>
> That's obviously wrong; 'base' should not be a null pointer. Can you track
> down why it is a null pointer?
First unsatisfactory first answer is: because of this call and the code used in
the functions called:
context.c 379 print_1_line (nullptr, line);
util.c 981 /* Print the text of a single line LINE,
util.c 982 flagging it with the characters in LINE_FLAG (which
say whether
util.c 983 the line is inserted, deleted, changed, etc.).
LINE_FLAG must not
util.c 984 end in a blank, unless it is a single blank. */
util.c 985
util.c 986 void
util.c 987 print_1_line (char const *line_flag, char const *const
*line)
util.c 988 {
util.c 989 print_1_line_nl (line_flag, line, false);
util.c 990 }
util.c 991
util.c 992 /* Print the text of a single line LINE,
util.c 993 flagging it with the characters in LINE_FLAG (which
say whether
util.c 994 the line is inserted, deleted, changed, etc.).
LINE_FLAG must not
util.c 995 end in a blank, unless it is a single blank. If
SKIP_NL is set, then
util.c 996 the final '\n' is not printed. */
util.c 997
util.c 998 void
util.c 999 print_1_line_nl (char const *line_flag, char const
*const *line, bool skip_nl)
util.c 1000 {
===> util.c 1001 char const *base = line[0], *limit = line[1]; /* Help
the compiler. */
util.c 1002 FILE *out = outfile; /* Help the compiler some more.
*/
util.c 1003 char const *flag_format = nullptr;
util.c 1004
util.c 1005 /* If -T was specified, use a Tab between the
line-flag and the text.
util.c 1006 Otherwise use a Space (as Unix diff does).
util.c 1007 Print neither space nor tab if line-flags are
empty.
util.c 1008 But omit trailing blanks if requested. */
util.c 1009
util.c 1010 if (line_flag && *line_flag)
util.c 1011 {
So presumingly the question is, why was line #379 in context.c reached? I'll
check this on my other Mac where diff is working.
Another question seems to be, why is the null pointer used when calling
fwrite()? A check should avoid this, rather early, and report or set some
failure status…
--
Greetings
Pete
One-Shot Case Study, n.:
The scientific equivalent of the four-leaf clover, from which it is concluded
all clovers possess four leaves and are sometimes green.
