libf2c/libF77/s_copy.c

   1 /* Unless compiled with -DNO_OVERWRITE, this variant of s_copy allows the
   2  * target of an assignment to appear on its right-hand side (contrary
   3  * to the Fortran 77 Standard, but in accordance with Fortran 90),
   4  * as in  a(2:5) = a(4:7) .
   5  */
   6
   7 #include "f2c.h"
   8
   9 /* assign strings:  a = b */
  10
  11 void
  12 s_copy (register char *a, register char *b, ftnlen la, ftnlen lb)
  13 {
  14   register char *aend, *bend;
  15
  16   aend = a + la;
  17
  18   if (la <= lb)
  19 #ifndef NO_OVERWRITE
  20     if (a <= b || a >= b + la)
  21 #endif
  22       while (a < aend)
  23         *a++ = *b++;
  24 #ifndef NO_OVERWRITE
  25     else
  26       for (b += la; a < aend;)
  27         *--aend = *--b;
  28 #endif
  29
  30   else
  31     {
  32       bend = b + lb;
  33 #ifndef NO_OVERWRITE
  34       if (a <= b || a >= bend)
  35 #endif
  36         while (b < bend)
  37           *a++ = *b++;
  38 #ifndef NO_OVERWRITE
  39       else
  40         {
  41           a += lb;
  42           while (b < bend)
  43             *--a = *--bend;
  44           a += lb;
  45         }
  46 #endif
  47       while (a < aend)
  48         *a++ = ' ';
  49     }
  50 }