source: trunk/gcc/libf2c/libF77/s_copy.c

/* Unless compiled with -DNO_OVERWRITE, this variant of s_copy allows the
 * target of an assignment to appear on its right-hand side (contrary
 * to the Fortran 77 Standard, but in accordance with Fortran 90),
 * as in  a(2:5) = a(4:7) .
 */

#include "f2c.h"

/* assign strings:  a = b */

void
s_copy (register char *a, register char *b, ftnlen la, ftnlen lb)
{
  register char *aend, *bend;

  aend = a + la;

  if (la <= lb)
#ifndef NO_OVERWRITE
    if (a <= b || a >= b + la)
#endif
      while (a < aend)
        *a++ = *b++;
#ifndef NO_OVERWRITE
    else
      for (b += la; a < aend;)
        *--aend = *--b;
#endif

  else
    {
      bend = b + lb;
#ifndef NO_OVERWRITE
      if (a <= b || a >= bend)
#endif
        while (b < bend)
          *a++ = *b++;
#ifndef NO_OVERWRITE
      else
        {
          a += lb;
          while (b < bend)
            *--a = *--bend;
          a += lb;
        }
#endif
      while (a < aend)
        *a++ = ' ';
    }
}