neuter.c

[詳解]

/*++
/* NAME
/*  neuter 3
/* SUMMARY
/*  neutralize characters before they can explode
/* SYNOPSIS
/*  #include <stringops.h>
/*
/*  char    *neuter(buffer, bad, replacement)
/*  char    *buffer;
/*  const char *bad;
/*  int replacement;
/* DESCRIPTION
/*  neuter() replaces bad characters in its input
/*  by the given replacement.
/*
/*  Arguments:
/* .IP buffer
/*  The null-terminated input string.
/* .IP bad
/*  The null-terminated bad character string.
/* .IP replacement
/*  Replacement value for characters in \fIbuffer\fR that do not
/*  pass the  bad character test.
/* LICENSE
/* .ad
/* .fi
/*  The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*  Wietse Venema
/*  IBM T.J. Watson Research
/*  P.O. Box 704
/*  Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <string.h>

/* Utility library. */

#include <stringops.h>

/* neuter - neutralize bad characters */

char   *neuter(char *string, const char *bad, int replacement)
{
    char   *cp;
    int     ch;

    for (cp = string; (ch = *(unsigned char *) cp) != 0; cp++)
    if (strchr(bad, ch) != 0)
        *cp = replacement;
    return (string);
}