wmSMPmon/wmSMPmon/general.c

   1 /*######################################################################
   2   #                                                                    #
   3   # This file contains some general utility functions for wmSMPmon.    #
   4   #                                                                    #
   5   # All of them were taken from the program 'top' from the procps      #
   6   # suite.                                                             #
   7   # With thanks to the author of top:                                  #
   8   #                      James C. Warner <warnerjc@worldnet.att.net>   #
   9   #                                                                    #
  10   # This file is placed under the conditions of the GNU Library        #
  11   # General Public License, version 2, or any later version.           #
  12   # See file COPYING for information on distribution conditions.       #
  13   #                                                                    #
  14   ######################################################################*/
  15
  16 #include "standards.h"
  17 #include "general.h"
  18
  19 /*
  20  * The usual program end --
  21  * called only by functions in this section. */
  22 void bye_bye(int eno, const char *str)
  23 {
  24         fflush(stdout);
  25         if (str) {
  26                 if (eno)
  27                         perror(str);
  28                 else {
  29                         fputs(str, stderr);
  30                         eno = 1;
  31                 }
  32         }
  33         exit(eno);
  34 }
  35
  36 /*
  37  * This routine simply formats whatever the caller wants and
  38  * returns a pointer to the resulting 'const char' string... */
  39 const char *fmtmk(const char *fmts, ...)
  40 {
  41         static char buf[BIGBUFSIZ];      /* with help stuff, our buffer */
  42         va_list va;                      /* requirements exceed 1k */
  43
  44         va_start(va, fmts);
  45         vsnprintf(buf, sizeof(buf), fmts, va);
  46         va_end(va);
  47         return ((const char *)buf);
  48 }
  49
  50 /*
  51  * Standard error handler to normalize the look of all err o/p */
  52 void std_err(const char *str)
  53 {
  54         static char buf[SMLBUFSIZ];
  55
  56         fflush(stdout);
  57         /* we'll use our own buffer so callers can still use fmtmk()
  58          * and, yes the leading tab is not the standard convention,
  59          * but the standard is wrong -- OUR msg won't get lost in
  60          * screen clutter, like so many others! */
  61         snprintf(buf, sizeof(buf), "\t%s: %s\n", Myname, str);
  62
  63         /* not to worry, he'll change our exit code to 1 due to 'buf' */
  64         bye_bye(0, buf);
  65 }
  66
  67 /*
  68  * Handle our own memory stuff without the risk of leaving the
  69  * user's terminal in an ugly state should things go sour. */
  70 void *alloc_c(unsigned numb)
  71 {
  72         void * p;
  73
  74         if (!numb)
  75                 ++numb;
  76         if (!(p = calloc(1, numb)))
  77                 std_err("failed memory allocate");
  78         return (p);
  79 }