Fix Issue 60; sub/gsub follow POSIX if POSIXLY_CORRECT in the environment.
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5
FIXES
5
FIXES
@ -25,6 +25,11 @@ THIS SOFTWARE.
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This file lists all bug fixes, changes, etc., made since the AWK book
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was sent to the printers in August, 1987.
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January 19, 2020:
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If POSIXLY_CORRECT is set in the environment, then sub and gsub
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use POSIX rules for multiple backslashes. This fixes Issue #66,
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while maintaining backwards compatibility.
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January 9, 2020:
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Input/output errors on closing files are now fatal instead of
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mere warnings. Thanks to Martijn Dekker <martijn@inlv.org>.
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10
awk.1
10
awk.1
@ -502,6 +502,16 @@ functions may be called recursively.
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Parameters are local to the function; all other variables are global.
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Thus local variables may be created by providing excess parameters in
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the function definition.
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.SH ENVIRONMENT VARIABLES
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If
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.B POSIXLY_CORRECT
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is set in the environment, then
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.I awk
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follows the POSIX rules for
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.B sub
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and
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.B gsub
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with respect to consecutive backslashes and ampersands.
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.SH EXAMPLES
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.TP
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.EX
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2
main.c
2
main.c
@ -22,7 +22,7 @@ ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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THIS SOFTWARE.
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****************************************************************/
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const char *version = "version 20200109";
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const char *version = "version 20200119";
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#define DEBUG
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#include <stdio.h>
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10
run.c
10
run.c
@ -1983,6 +1983,13 @@ void backsub(char **pb_ptr, const char **sptr_ptr) /* handle \\& variations */
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{ /* sptr[0] == '\\' */
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char *pb = *pb_ptr;
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const char *sptr = *sptr_ptr;
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static bool first = true;
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static bool do_posix = false;
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if (first) {
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first = false;
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do_posix = (getenv("POSIXLY_CORRECT") != NULL);
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}
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if (sptr[1] == '\\') {
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if (sptr[2] == '\\' && sptr[3] == '&') { /* \\\& -> \& */
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@ -1992,6 +1999,9 @@ void backsub(char **pb_ptr, const char **sptr_ptr) /* handle \\& variations */
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} else if (sptr[2] == '&') { /* \\& -> \ + matched */
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*pb++ = '\\';
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sptr += 2;
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} else if (do_posix) { /* \\x -> \x */
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sptr++;
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*pb++ = *sptr++;
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} else { /* \\x -> \\x */
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*pb++ = *sptr++;
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*pb++ = *sptr++;
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