fscanf man page on DigitalUNIX

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Digital UNIX Diffs - scanf(5)			 Digital UNIX Diffs - scanf(5)

       scanf, fscanf, sscanf -	Converts formatted input

	Standard C Library (libc.so, libc.a)

       #include <stdio.h>

       int scanf(
	       const char *format

       int fscanf(
	       FILE *stream,
	       const char *format

       int sscanf(
	       const char *string,
	       const char *format

       Specifies  the  format conversion.  Specifies the input stream.	Speci‐
       fies input to be read.  Points to the location to store the interpreted

       vms-vaxc(5): OpenVMS VAX C vs DEC C Differences

       The  ANSI  C  standard-defined  behavior	 for  negated  scansets in the
       scanf(3) function is different from the VAX C RTL behavior.  The	 stan‐
       dard  requires  at least one character to match.	 For example, the fol‐
       lowing code fails if it encounters an empty line:

	    /* read lines and throw away the newline */	     fscanf("%[^0%*c",

       The DEC C RTL requires the code to be implemented as follows:

	    /*	 read	lines	and   throw   away   the  newline  */	    if
       (fscanf("%[^0%*c",  &string)  ==	 0)		fscanf("%*c");	    /*
       swallow blank-line newline */

       ultrix-system(5): DEC ULTRIX Operating System Differences

       On  Digital  UNIX,  the	scanf(3)  functions  do not support the use of
       uppercase format specifiers, whereas, DEC ULTRIX will accept an	upper‐
       case  specifier	as  an equivalent for lowercase one.  Examples include
       the %D, %U, %O and %X format specifiers. If  applications  use  the  %D
       format  specifier  to scan in a long number in decimal format, the scan
       functions uses the character D as a delimiter rather than a  conversion
       specification.  Instead,	 use  the  %d (or %ld), %u, %o and %x, respec‐

       alpha-32bits(5): 32 vs 64 bit Differences

       When using the scanf() function for long types, you use the length mod‐
       ifier  l	 (lower-case  letter  L) with the d, i, o, u, and x conversion
       characters to specify assignment of type long or	 unsigned  long.   For
       example,	 when  reading	a long as a signed decimal, use %ld instead of
       %d. When reading a long as an unsigned decimal, use %lu instead of  %u.
       If  you	omit  the  length  modifier, the type is assumed to be int, or
       unsigned int, depending on the conversion character.  In this case, the
       long types are converted to the smaller int types and information might
       be lost.

       When using the l modifier followed by a e, f, or g indicates  that  the
       receiving variable will be treated as a double instead of a float.

       As  a  rule,  to read an integer of arbitrary size, cast the integer to
       long or unsigned long, and use the %ld (unsigned long) conversion char‐
       acter. For example:

	    scanf ("%ld\n", (long) num);

       32-Bit	   Platform			    |	    AXP	      Platform
					  |	       long		count;
       | long count;
					  |		    scanf("COUNT:\n");
       | scanf("COUNT:\n"); scanf(" decimal  = %d \n", count); | scanf(" deci‐
       mal   =	%ld  \n", count); scanf(" unsigned = %u \n", count); | scanf("
       unsigned = %lu \n", count);  scanf("  octal     =  %o  \n",  count);  |
       scanf("	octal	 = %lo \n", count); scanf(" hex	     = %x \n", count);
       | scanf(" hex	  = %lx \n", count);

       Functions:  scanf(3), fscanf(3), sscanf(3)

	vms-vaxc(5), alpha-32bits(5)

       delim off

						 Digital UNIX Diffs - scanf(5)

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