From Bugzilla Helper:
User-Agent: Mozilla/4.77 [en] (X11; U; Linux 2.4.2-2 i586)

Description of problem:
When using strtod() and friends on the input string "infinity" (preceded by
an optional plus or minus sign), it only scans as far as "inf".  Although
the conversion is valid in either case, the pointer stored in *endptr will
be incorrect.

The standard states that the subject sequence is defined as the *longest*
initial sequence of the input string that is of the expected form.


How reproducible:
Always

Steps to Reproduce:
Compile and run the following program:

#include <stdio.h>
#define __USE_ISOC99 1
#include <math.h>
#include <stdlib.h>

const char *test_strings[] = {
  "inf", "INF", "infinity", "INFINITY", "Inf", "iNfInItY",
  "+inf", "+INF", "+infinity", "+INFINITY", "+Inf", "+InFiNiTy",
  "-inf", "-INF", "-infinity", "-INFINITY", "-Inf", "-INFinitY",
};

const char *test_formats[] = { "%a%n", "%e%n", "%f%n", "%g%n",
			       "%A%n", "%E%n", "%F%n", "%G%n" };

int
main ()
{
  int i, j, l, n;
  float f;
  char *endp;

  for (i = 0; i < sizeof (test_strings) / sizeof (test_strings[0]); i++) {
    f = strtof (test_strings[i], &endp);
    if (*endp)
      fprintf (stderr, "Error: strtof(\"%s\") scanned %d characters\n",
	       test_strings[i], endp - &test_strings[i][0]);
    else if (!isinf(f))
      fprintf (stderr, "Error: strtof(\"%s\") returned %g\n",
	       test_strings[i], f);
    else
      fprintf (stderr, "strtof(\"%s\") passed\n", test_strings[i]);

    for (j = 0; j < sizeof (test_formats) / sizeof (test_formats[0]); j++)
{
      f = 0.0F;
      l = -1;
      n = sscanf (test_strings[i], test_formats[j], &f, &l);
      if (n < 1)
	fprintf (stderr, "Error: sscanf(\"%s\",\"%s\",&f) returned %d\n",
		 test_strings[i], test_formats[j], n);
      if ((l >= 0) && test_strings[i][l])
	fprintf (stderr,
		 "Error: sscanf(\"%s\",\"%s\",&f) scanned %d characters\n",
		 test_strings[i], test_formats[j], l);
      if (!isinf (f) && ((n >= 1) || (f != 0.0F)))
	fprintf (stderr, "Error: sscanf(\"%s\",\"%s\",&f) stored %g\n",
		 test_strings[i], test_formats[j], f);
      if ((n >= 1) && isinf (f))
	fprintf (stderr, "sscanf(\"%s\",\"%s\",&f) passed\n",
		 test_strings[i], test_formats[j]);
    }
  }
}


Actual Results:  (sscanf test results omitted:)

strtof("inf") passed
strtof("INF") passed
Error: strtof("infinity") scanned 3 characters
Error: strtof("INFINITY") scanned 3 characters
strtof("Inf") passed
Error: strtof("iNfInItY") scanned 3 characters
strtof("+inf") passed
strtof("+INF") passed
Error: strtof("+infinity") scanned 4 characters
Error: strtof("+INFINITY") scanned 4 characters
strtof("+Inf") passed
Error: strtof("+InFiNiTy") scanned 4 characters
strtof("-inf") passed
strtof("-INF") passed
Error: strtof("-infinity") scanned 4 characters
Error: strtof("-INFINITY") scanned 4 characters
strtof("-Inf") passed
Error: strtof("-INFinitY") scanned 4 characters


Expected Results:  All 18tests should pass


Additional info:

c.f. WG14/N869 7.20.1.3#3-4