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From: Orlando Sotomayor-Diaz (The Moderator) <cbosgd!std-c>


mod.std.c Digest            Thu, 15 May 86       Volume 16 : Issue  18

Today's Topics:
         MORE C standard differences Apr85-Feb86, part 8 of 9
----------------------------------------------------------------------

Date: 
From: ihnp4!utzoo!lsuc!msb
Subject: MORE C standard differences Apr85-Feb86, part 8 of 9
To: utzoo!ihnp4!hou2d!osd

# D.12.2.1 The clock function

  *    The clock function returns ...  the processor time used  {-->  by
       the program} since the beginning of an implementation-defined era
  *    {--> related only to the program invocation}.



# D.12.2.2 The time function

N-->   The encoding of the value is unspecified.



# D.12.2.2 The time function

  *    The time function returns ...  the current calendar  time  {since
       the beginning of an implementation-defined era -->}.



# D.12.3.1 The asctime function

       The asctime function converts the broken-down time in the  struc-
  *    ture  pointed  to  by timeptr into a {26-character -->} string in
  *    the {following -->} form {.  All the fields have constant  width.
       -->}

                   Sun Sep 16 01:03:52 1973\n\0

N-->   using the equivalent of the following algorithm:

N-->   char *asctime(const struct tm *timeptr)
N-->   {
N-->               static const char wday_name[7][3] = {
N-->                     "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
N-->               };
N-->               static const char mon_name[12][3] = {
N-->                     "Jan", "Feb", "Mar", "Apr", "May", "Jun",
N-->                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
N-->               };
N-->               static char result[26];

N-->               (void) sprintf(result, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",
N-->                     wday_name[timeptr->tm_wday],
N-->                     mon_name[timeptr->tm_mon],
N-->                     timeptr->tm_mday, timeptr->tm_hour,
N-->                     timeptr->tm_min, timeptr->tm_sec,
N-->                     1900 + timeptr->tm_year);
N-->               return result;
N-->   }



# C.12.3.2 The ctime function

N-->   It is equivalent to

N-->               asctime(localtime(timer))

N-->   ...  Forward references: the localtime function (#D.12.3.5).



# {--> D.13 FUTURE DIRECTIONS}



# {--> D.13.1 Character handling <ctype.h>}

N-->   Function names that begin with "is" and  "to"  and  a  lower-case
N-->   letter may be added to the declarations in the <ctype.h> header.



# {--> D.13.2 Mathematics <math.h>}

N-->   The names of all existing  functions  declared  in  the  <math.h>
N-->   header,  suffixed  with  f  or  l, are reserved for corresponding
N-->   functions with float and long double arguments and return values,
N-->   respectively.



# {--> D.13.3 Signal handling <signal.h>}

N-->   Macros that begin with SIG and an upper-case letter may be  added
N-->   to the definitions in the <signal.h> header.



# {--> D.13.4 Input/output <stdio.h>}

N-->   The use of leading 0 in fprintf format to  request  padding  with
N-->   leading  zeros  is deprecated.  Use the "precision" specifier in-
N-->   stead.

N-->   Lower-case letters may be added to the conversion  specifiers  in
N-->   fprintf and fscanf.  Other characters may be used in extensions.



# {--> D.13.5 String handling <string.h>

N-->   Function names that begin with "str" and "mem" and  a  lower-case
N-->   letter may be added to the declarations in the <string.h> header.



# E. APPENDICES

Remark: Since the appendices are not part of the Standard, I have
included  only  certain  ones here.  The ones I included were the
new section #E.2 Sequence Points, section #{E.3 -->  E.5}  Common
Warnings, and section #{E.5 --> E.6} Portability Issues.



# {--> E.2 SEQUENCE POINTS}

N-->   The following are the sequence points described in #B.1.2.3.

N-->   * The call to a function, after the arguments have been evaluated
N-->     (#C.3.2.2).

N-->   * The logical AND operator && (#C.3.2.13).

N-->   * The logical OR operator || (#C.3.2.14).

N-->   * The conditional operator ? (#C.3.2.15).

N-->   * The comma operator , (#C.3.2.17).

N-->   * Completion of the evaluation of a full expression: an  initial-
N-->     izer of an object that has automatic storage duration (#C.5.6);
N-->     the expression in an expression statement  (#C.6.3);  the  con-
N-->     trolling  expression  of  a  selection statement (if or switch)
N-->     (#C.6.4); the controlling expression of an iteration  statement
N-->     (while, do, or for) (#C.6.5).



  # {E.3 --> E.5} COMMON WARNINGS

       * An implicit narrowing conversion is encountered,  such  as  the
  *      assignment  of  a  long  int  or  a double to an int {-->, or a
         pointer to void to a pointer to any type of object  other  than
         char (#C.2)}.

       ...

<--O   * A declaration with no effect is encountered (#C.5).

N-->   * An object is defined but not used (#C.5).



# {E.5.1 --> E.6.1} Unspecified behavior

N-->   * The behavior if a printable character is written when  the  ac-
N-->     tive position is at the final position of a line (#B.2.2).

N-->   * The behavior if a backspace character is written when  the  ac-
N-->     tive position is at the initial position of a line (#B.2.2).

N-->   * The behavior if a horizontal tab character is written when  the
N-->     active position is at or past the last defined horizontal tabu-
N-->     lation position (#B.2.2).

N-->   * The behavior if a vertical tab character is  written  when  the
N-->     active position is at or past the last defined vectical tabula-
N-->     tion position (#B.2.2).



# {E.5.1 --> E.6.1} Unspecified behavior

N-->   * The order in an array sorted  by  the  qsort  function  of  two
N-->     members that compare as equal (#D.10.5.2).



# {E.5.1 --> E.6.1} Unspecified behavior

N-->   * The encoding of the calendar time returned by the time function
N-->     (#D.12.2.2).

------------------------------

End of mod.std.c Digest - Thu, 15 May 86 13:32:29 EDT
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