--- Begin Message --->> ... >> Nelson> Sun Solaris 2.7 and 2.8: >> Nelson> Testing >> /export/staff/computing/beebe/i386/build/guile-1.5.6/pre-inst-guile ... >> Nelson> with >GUILE_LOAD_PATH=/export/staff/computing/beebe/i386/build/guile-1.5.6/test-suite >> Nelson> ERROR: regexp.test: regexp-substitute/global: ("" "" ""): >> port is string port - arguments: ((regular-expression-syntax "make-regexp" >> "empty (sub)expression" #f #f)) >> Nelson> ERROR: regexp.test: regexp-substitute/global: ("" "" ""): >> port is #f - arguments: ((regular-expression-syntax "make-regexp" "empty >> (sub)expression" #f #f)) >> >> These errors are being passed through from the Solaris libc's >> implementation of regcomp and regerror - apparently, its regcomp >> doesn't handle empty expressions. Perhaps best just documented and >> lived with, although we could probably code a workaround on the Scheme >> level if we wanted to. >> ...I made a small test program, with one illegal pattern to regcomp(), and one empty one, and then ran it on 16 or so platforms: % cat regcomp.c #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <regex.h> #include <errno.h> #ifndef EXIT_SUCCESS #define EXIT_SUCCESS 0 #endif int main(int argc, char* argv[]) { int ret; regex_t preg; ret = regcomp(&preg, "[", 0); if (ret != 0) { (void)printf("regcomp(&preg, \"[\", 0) returns %ld\n", ret); perror("perror() says: "); } ret = regcomp(&preg, "", 0); if (ret != 0) { (void)printf("regcomp(&preg, \"\", 0) returns %ld\n", ret); perror("perror() says: "); } return (EXIT_SUCCESS); } Most platforms produced output like this: cc regcomp.c && ./a.out regcomp(&preg, "[", 0) returns 7 perror() says: : Error 0 Both Solaris 2.7 and 2.8 behaved this way. However, two platforms, Apple Darwin (== MacOS X) and FreeBSD 4.4.0, gave an error for the empty string: % cc regcomp.c && ./a.out regcomp(&preg, "[", 0) returns 7 perror() says: : Undefined error: 0 regcomp(&preg, "", 0) returns 14 perror() says: : Undefined error: 0 On HP-UX 10.01, a.out appeared to go into an infinite loop, and I had to kill the xterm window to it, since it did not respond to Ctl-C. That could be a different problem: that particular local system has a history of suddenly becoming inaccessible, and at the moment, I cannot get a fresh connection to it. Based on these experiments, I recommend that guile should take special care never to pass an empty pattern to regcomp(). ------------------------------------------------------------------------------- - Nelson H. F. Beebe Tel: +1 801 581 5254 - - Center for Scientific Computing FAX: +1 801 585 1640, +1 801 581 4148 - - University of Utah Internet e-mail: [EMAIL PROTECTED] - - Department of Mathematics, 110 LCB [EMAIL PROTECTED] [EMAIL PROTECTED] - - 155 S 1400 E RM 233 [EMAIL PROTECTED] - - Salt Lake City, UT 84112-0090, USA URL: http://www.math.utah.edu/~beebe - ------------------------------------------------------------------------------- _______________________________________________ Bug-guile mailing list [EMAIL PROTECTED] http://mail.gnu.org/mailman/listinfo/bug-guile--- End Message ---
