Strings for the PC
Walter Bright
bright at dataioDataio.UUCP
Sat Feb 8 04:52:04 AEST 1986
Here's a program I wrote a while back to look at any file and dump
out any ascii strings in it. It's fun to try it out on various MS-DOS
files to see what strings are embedded in them. It's very useful to
run strings on new suspect public domain programs before you run them
to get some idea of what they do (like 'trashing hard disk').
To compile it with Datalight C:
DLC -mci strings
which will generate STRINGS.COM. For those who just want to run it,
a uuencoded version follows.
--------------- Source code starts -------------
/*_ strings.c 05-Feb-86 Walter Bright */
/**************************************************
* Find the printable strings in a file.
* Copyright (C) 1986 by Northwest Software
* All Rights Reserved
* Use:
* strings file
*/
#include <stdio.h>
#define BUFMAX 255 /* buffer size */
char buffer[BUFMAX + 1];
int bufpnt; /* index into buffer[] */
int number = 3; /* min string length */
FILE *fin; /* input file */
bool flag_h = FALSE; /* TRUE means dump offset in hex */
long offset;
int xc;
main(argc,argv)
int argc;
char *argv[];
{ int i;
if (argc != 2)
{ fprintf(stderr,"Error: wrong number of arguments\n");
fprintf(stderr,"Use: strings file\n");
exit(1);
}
fin = fopen(argv[1],"rb"); /* open file for binary read */
if (!fin)
{ fprintf(stderr,"Can't open file '%s'\n",argv[1]);
exit(1);
}
offset = 0;
while (TRUE)
{
offset += bufpnt;
bufpnt = 0;
xc = fgetc(fin); /* read char from file */
offset++;
while (isprint(xc) && bufpnt < BUFMAX)
{ buffer[bufpnt++] = xc;
xc = fgetc(fin);
}
if (bufpnt >= number
#if 0
&& (xc == '\0' || xc == '\n' || xc == '\r' ||
xc == '$' || bufpnt == BUFMAX)
#endif
)
{ buffer[bufpnt] = '\0';
if (flag_h) printf("%5lx ",offset - 1);
printf("%s\n",buffer);
}
if (xc == EOF) break;
}
}
bool isprint(c)
int c;
{
return c >= ' ' && c <= '~';
}
---------- Source code ends ------ STRINGS.COM starts ---------
begin 644 strings.com
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end
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