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 #ifdef KR_headers
  12 VOID s_copy(a, b, la, lb) register char *a, *b; ftnlen la, lb;
  13 #else
  14 void s_copy(register char *a, register char *b, ftnlen la, ftnlen lb)
  15 #endif
  16 {
  17         register char *aend, *bend;
  18
  19         aend = a + la;
  20
  21         if(la <= lb)
  22 #ifndef NO_OVERWRITE
  23                 if (a <= b || a >= b + la)
  24 #endif
  25                         while(a < aend)
  26                                 *a++ = *b++;
  27 #ifndef NO_OVERWRITE
  28                 else
  29                         for(b += la; a < aend; )
  30                                 *--aend = *--b;
  31 #endif
  32
  33         else {
  34                 bend = b + lb;
  35 #ifndef NO_OVERWRITE
  36                 if (a <= b || a >= bend)
  37 #endif
  38                         while(b < bend)
  39                                 *a++ = *b++;
  40 #ifndef NO_OVERWRITE
  41                 else {
  42                         a += lb;
  43                         while(b < bend)
  44                                 *--a = *--bend;
  45                         a += lb;
  46                         }
  47 #endif
  48                 while(a < aend)
  49                         *a++ = ' ';
  50                 }
  51         }