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Date: Fri, 8 Jul 2016 17:16:22 +0000 (UTC)
From: Owen Leibman <eclipsechasers2 AT yahoo DOT com>
Reply-To: Owen Leibman <eclipsechasers2 AT yahoo DOT com>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Message-ID: <768145014.4380137.1467998182030.JavaMail.yahoo@mail.yahoo.com>
Subject: scanf and m modifier
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References: <768145014 DOT 4380137 DOT 1467998182030 DOT JavaMail DOT yahoo DOT ref AT mail DOT yahoo DOT com>

The m modifier is handled just fine by the compiler, but
the results of using it are different on Cygwin than on several other systems
I've tried. Here is a sample program:
 
#include <stdio.h>
#include <stdlib.h>
#define NAMELEN 100
int main(void) {
  char *f =
"inputstring", title[NAMELEN], *buffer = 0;
  int scanrc;
  scanrc =
sscanf(f, "%ms", &buffer);
  if (scanrc <
1) {
    snprintf(title,
sizeof(title), "sscanf failed");
  } else {
    snprintf(title,
sizeof(title), "%s", buffer);
    free(buffer);
  }
  printf("title is %s.\n", title);
  return 0;
}
 
The expected result is "title is inputstring",
which is what I see on Ubuntu and RedHat systems.
 
What I see in Cygwin is "sscanf failed".
 
My compile command is:
gcc -Wall program.c
 
No warnings are issued. I have also tried adding various
flavors of -D_XOPEN_SOURCE and -D_POSIX_SOURCE, all without success. Is there
some compile option I need to add, or is my program wrong, or is there a

problem with the library code in Cygwin?

BTW, on a very old Solaris system with a very old version of gcc (3.3), I did receive the following message:
replscan3.c:7: warning: unknown conversion type character `m' in format
That is far from ideal, but it is better than the inconsistency between the compiler and the run-time which I'm seeing in Cygwin.

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