eliminate more trivial format strings ("%s", "...") #23127
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As a follow-up to commit 71d1d45, turn more trivial format strings (i.e. "%s" followed by a string literal) into just that string literal. - dump.c: String literals are more efficiently appended using sv_catpvs; C strings using sv_patv. No need to invoke the entire sv_catpvf machinery to parse a static "format string" of length 1. - malloc.c: Disentangle some warning messages and make them properly match their (previously orphaned) perldiag entries again. - os2/perlrexx.c: Turn sprintf(x, "...") into strcpy(x, "...").
Before:
malloc.c: In function ‘getpages’:
malloc.c:273:34: warning: ignoring return value of ‘write’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
273 | # define fatalcroak(mess) (write(2, (mess), strlen(mess)), exit(2))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
malloc.c:1546:21: note: in expansion of macro ‘fatalcroak’
1546 | fatalcroak("panic: Off-page sbrk\n");
| ^~~~~~~~~~
malloc.c:273:34: warning: ignoring return value of ‘write’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
273 | # define fatalcroak(mess) (write(2, (mess), strlen(mess)), exit(2))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
malloc.c:1585:13: note: in expansion of macro ‘fatalcroak’
1585 | fatalcroak("Misalignment of sbrk()\n");
| ^~~~~~~~~~
gcc -c -DPERL_CORE -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -std=c99 -O2 -Wall -Werror=pointer-arith -Werror=vla -Wextra -Wno-long-long -Wno-declaration-after-statement -Wc++-compat -Wwrite-strings -Wno-use-after-free universal.c
(The "make depend" comment was overlooked in commit b9e5552.)
ilmari
approved these changes
Mar 18, 2025
Leont
approved these changes
Mar 18, 2025
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As a follow-up to commit 71d1d45, turn more trivial format strings (i.e.
"%s"followed by a string literal) into just that string literal.sv_catpvs; C strings usingsv_patv. No need to invoke the entiresv_catpvfmachinery to parse a static "format string" of length 1.sprintf(x, "...")intostrcpy(x, "...").