string.c

来自「汇编语言编的关于ov143b.asm的小程序」· C语言 代码 · 共 62 行

/*  005  8-Jun-87  string.c

        Common string related functions.

        Copyright (c) 1987 by Blue Sky Software.  All rights reserved.
*/

#ifndef NULL
#define NULL (0)
#endif

#ifdef LINT_ARGS
#include <memory.h>
#endif


/*****************************************************************************
                              C A T N S T R
 *****************************************************************************/

char *
catnstr(s1,s2,max)     /* concat s2 to s1 (or as much as will fit) */
char *s1, *s2;
int max;
{
   int l1, l2;

   if ((l1 = strlen(s1)) + (l2 = strlen(s2)) <= max)
      strcat(s1,s2);
   else
      if (l1 < max)
         strncat(s1,s2,max-l1);

   return(s1);
}


/*****************************************************************************
                            S T R C P Y F I L L
 *****************************************************************************/

char *
strcpyfill(to,from,fldlen,fillch)      /* copy a string with char fill */
char *from;
register char *to;
int fldlen, fillch;
{
   char *to_where;
   register int len;

   to_where = to;
   len = strlen(from);

   if (len < fldlen) {
      strncpy(to,from,len);
      memset(to+len,fillch,fldlen-len);
   } else
     strncpy(to,from,fldlen);

   return(to_where);
}