Usenet 1994 January/usenetsourcesnewsgroupsinfomagicjanuary1994.iso/sources/unix/volume26/pcomm-2.0.2/part02/e_lib.c

C/C++ Source or Header | 1993-04-13 | 3.8 KB | 176 lines

/*
 * Routines to manipulate the pcomm.extrnl file
 */

#include <stdio.h>
#include "extrnl.h"

/*
 * Read the external file transfer program database.  Returns a pointer
 * to a static area containing the EXTRNL structure.  This support file is
 * optional.
 */

struct EXTRNL *
read_extrnl()
{
    extern char *null_ptr;
    FILE *fp, *uid_fopen();
    int i, line, up, entry, oops;
    char *str_dup(), buf[200], message[80], token[40], *str_tok(), *str;
    char *sep, *temp_token, *findfile();
    static struct EXTRNL e;
    void error_win();

    if ((e.e_path = findfile("pcomm.extrnl")) == NULL) {
                    /* not required to exist */
        for (i=0; i<3; i++) {
            e.name[0][i] = null_ptr;
            e.command[0][i] = null_ptr;
            e.prompt[0][i] = 'N';
            e.name[1][i] = null_ptr;
            e.command[1][i] = null_ptr;
            e.prompt[1][i] = 'N';
        }
        e.up_entries = 0;
        e.dn_entries = 0;

        return(&e);
    }

    if (!(fp = uid_fopen(e.e_path, "r"))) {
        sprintf(buf, "\"%s\" for read", e.e_path);
        error_win(1, "Can't open external program file", buf);
    }

    sep = ";;\n";
    line = 0;
    up = 1;
    oops = 0;
    while (fgets(buf, 200, fp) != NULL) {
        line++;
        if (line <= 3)
            entry = line-1;
        else {
            up = 0;
            entry = line-4;
        }
                    /* get the token */
        if (!(temp_token = str_tok(buf, '='))) {
            sprintf(message, "is missing a token at line %d", line);
            oops++;
            break;
        }
        /*
         * Parse the rest of the line.  This is similar to using
         * the "real" strtok() function, but this version returns
         * a pointer to NULL if the token is missing.  Note the
         * use of the array of separators.
         */
        for (i=0; i<3; i++) {
            if (!(str = str_tok((char *) NULL, sep[i]))) {
                sprintf(message, "is missing a parameter at line %d", line);
                oops++;
                break;
            }
            switch(i) {
                case 0:
                    e.name[up][entry] = str_dup(str);
                    break;
                case 1:
                    e.command[up][entry] = str_dup(str);
                    break;
                case 2:
                    e.prompt[up][entry] = *str;
                    break;
            }
        }
        if (oops)
            break;

                    /* sanity checking */
        if (up)
            sprintf(token, "SEND_%d", entry+1);
        else
            sprintf(token, "RCV_%d", entry+1);

        if (strcmp(temp_token, token)) {
            sprintf(message, "is corrupted at line %d", line);
            oops++;
            break;
        }
    }
    fclose(fp);

    if (oops) {
        sprintf(buf, "External program file \"%s\"", e.e_path);
        error_win(1, buf, message);
    }
                    /* find number of upload entries */
    for (i=0; i<3; i++) {
        if (e.name[1][i] == null_ptr)
            break;
    }
    e.up_entries = i;
                    /* find number of download entries */
    for (i=0; i<3; i++) {
        if (e.name[0][i] == null_ptr)
            break;
    }
    e.dn_entries = i;
                    /* if empty database */
    if (!e.up_entries || !e.dn_entries) {
        sprintf(buf, "External program file \"%s\"", e.e_path);
        error_win(0, buf, "has no data");
    }

    return(&e);
}

/*
 * Update the external file transfer program database.  A non-zero return
 * code means a non-fatal error.
 */

int
up_extrnl()
{
    FILE *fp, *uid_fopen();
    int i, up, entry;
    char buf[200];
    void error_win();

    /*
     * I don't remember why I made this file optional.  For the next
     * release, it will be mandatory!  The following is kludge to tell
     * the user that there is no file to save anything to.
     */
    if (extrnl->e_path == NULL) {
        error_win(0, "No \"pcomm.extrnl\" file in use", "");
        return(1);
    }
                    /* open for write */
    if (!(fp = uid_fopen(extrnl->e_path, "w"))) {
        sprintf(buf, "\"%s\"", extrnl->e_path);
        error_win(0, "No write permission on external program file", buf);
        return(1);
    }
                    /* put 'em back */
    up = 1;
    for (i=0; i<6; i++) {
        if (i < 3)
            entry = i;
        else {
            up = 0;
            entry = i-3;
        }
        if (up)
            fprintf(fp, "SEND_%d=%s;%s;%c\n", entry+1, extrnl->name[up][entry], extrnl->command[up][entry], extrnl->prompt[up][entry]);
        else
            fprintf(fp, "RCV_%d=%s;%s;%c\n", entry+1, extrnl->name[up][entry], extrnl->command[up][entry], extrnl->prompt[up][entry]);
    }

    fclose(fp);
    return(0);
}