strings.c

使用于OS/2下的小工具的C源程序,使用于OS/2下的小工具的C源程序

/*
* STRINGS.C - Output printable ascii strings from a binary file.
*	      E.g. this can be used to locate identifier strings from .EXE-files
*	      or other messages.
*
* PROGRAMMER:	    Martti Ylikoski
* CREATED:	    1.12.1990
*/
static char *VERSION= "Version 1.1. Copyright (c) Martti Ylikoski, 1990. 1991." ;
/*
*/

#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <param.h>
#include <paramstd.h>

/* in MTOOLSP.LIB */
int Pageprintf(int rows, char *fmt, ...) ;

static char *progname, *fname	;
extern unsigned long pflags ;

ParamEntry pentry[12] = {
     "P", &ParamSetPause, 1,
     "F", &ParamSetFold, 0,
     "V", &ParamSetVerbose, 0,
     "R", &ParamSetReport, 0,
     "S", &ParamSetSubDirs, 0,
     "?", &ParamSetHelp, 1,
     "H", &ParamSetHelp, 1,
     "NOD", &ParamSetNoDefault, 0,
     "TEST", &ParamSetTest, 0,
     "Y", &ParamSetYes, 0,
     "N", &ParamSetTest, 0,
     "\0", NULL, 0
} ;

ParamBlock params = {
    "/-",   IGNORECASE | NOPRIORITY | NOTRIGGERSALLOWED ,
    pentry
} ;

static int fhnd, count = 5 ;
static char *optr ;
/* local prototypes */
static int strings( char *fname ) ;

int main(int argc, char *argv[])
{
int i ;

   progname = argv[0] ;

   ParamHandle(&params, &argc, argv) ;

   if( pflags & PA_HELP || argc == 1)
   {
      printf("%s - locate and output printable ascii strings from binary files.\n", progname) ;
      puts(VERSION) ;
      puts("Usage: strings [/H | /?] [/P] file -count") ;
      puts("Where,") ;
      puts("     /P    = Pause       /H,/? = Help");
      return( 0 ) ;
   }

   for (i = 1 ; i < argc; i++)
   {
      if (argv[i][0] == '-' && strlen(argv[i]) > 1 )
	 count = atoi(&argv[i][1]) ;
   }

   /* allocate space for buffer to gather output chars.*/
   if ((optr = calloc((size_t) 1, (size_t) max (80, count + 1) )) == NULL)
   {
      printf("%s: error allocating memory...\nExiting...\n", progname) ;
      return( 1 ) ;
   }

   for (i = 1 ; i < argc; i++)
      if (argv[i][0] != '-' && argv[i][0] != '/')
	 strings(argv[i]) ;
      else
	 if (strcmp(argv[i], "-") == 0)
	    strings("-") ;

   return( 0 ) ;
}

/******************************************
* strings() - locate and output printable ascii strings from an executable
* file. Strings uses a naive algorithm to output every string of printable
* chars of a given length. It uses the global identifier count as the
* requested length.
*******************************************/

static int strings( char *fname )
{
FILE *fptr ;
int i, c ;

   if (strcmp(fname, "-") == 0)
      fptr = stdin ;
   else
      /* open file */
      if ((fptr = fopen(fname, "rb")) == NULL)
      {
	 printf("%s: unable to open file %s for reading...\n", progname, fname) ;
	 return( 1 ) ;
      }

   i = 0 ;
   /* read from file */
   while ( (c = fgetc(fptr)) != EOF)
   {
      if (isprint(c) != 0)
      {
	 optr[i] = (char) c ;
	 i++ ;
	 if (i >= max(79, count) ) /* buffer full */
	 {
	    optr[i] = '\0' ;
	    /*fputs(optr, stdout) ;
	    fputs("\n", stdout) ;*/
	    Pageprintf(24, "%s\n", optr) ;
	    i = 0 ;
	 }
      }
      else
	 if (i >= count ) /* matching number of chars found */
	 {
	   optr[i] = '\0' ;
	   /* fputs(optr, stdout) ;
	   fputs("\n", stdout) ;*/
	   Pageprintf(24, "%s\n", optr) ;
	   i = 0 ;
	 }
	 else
	    i = 0 ;
   }

   /* close file */
   fclose (fptr ) ;
   return( 0 ) ;
}