ipconfig.c

#include <errno.h>
#include <string.h>
#include <malloc.h>
#include <stdlib.h>
#include <stdio.h>

#include <fileXio_rpc.h>

#include "ipconfig.h"

static char *GetNextToken(char *line, char delimiter)
{
    char *field_end, *result;
    static char *current_line = NULL;

    result = NULL;

    if (line != NULL) {
        current_line = line;
    }

    while (*current_line == delimiter)
        current_line++;
    if (current_line[0] != '\0') {
        if ((field_end = strchr(current_line, delimiter)) == NULL) {
            field_end = &current_line[strlen(current_line)];
        }

        *field_end = '\0';

        if (current_line[1] != '\0') { // Test to see if there is another token after this one.
            result       = current_line;
            current_line = field_end + 1;
        } else
            current_line = NULL;
    } else
        current_line = NULL;

    return result;
}

int ParseConfig(const char *path, char *ip_address, char *subnet_mask, char *gateway)
{
    int fd, result, size;
    char *FileBuffer, *line, *field;
    unsigned int i, DataLineNum;

    if ((fd = fileXioOpen(path, O_RDONLY)) >= 0) {
        size = fileXioLseek(fd, 0, SEEK_END);
        fileXioLseek(fd, 0, SEEK_SET);
        if ((FileBuffer = malloc(size)) != NULL) {
            if (fileXioRead(fd, FileBuffer, size) == size) {
                if ((line = strtok(FileBuffer, "\r\n")) != NULL) {
                    result      = EINVAL;
                    DataLineNum = 0;
                    do {
                        i = 0;
                        while (line[i] == ' ')
                            i++;
                        if (line[i] != '#' && line[i] != '\0') {
                            if (DataLineNum == 0) {
                                if ((field = GetNextToken(line, ' ')) != NULL) {
                                    strncpy(ip_address, field, 15);
                                    ip_address[15] = '\0';
                                    if ((field = GetNextToken(NULL, ' ')) != NULL) {
                                        strncpy(subnet_mask, field, 15);
                                        subnet_mask[15] = '\0';
                                        if ((field = GetNextToken(NULL, ' ')) != NULL) {
                                            strncpy(gateway, field, 15);
                                            gateway[15] = '\0';
                                            result      = 0;
                                            DataLineNum++;
                                        }
                                    }
                                }
                            }
                        }
                    } while ((line = strtok(NULL, "\r\n")) != NULL);
                } else
                    result = EINVAL;
            } else
                result = EIO;

            free(FileBuffer);
        } else
            result = ENOMEM;

        fileXioClose(fd);
    } else
        result = fd;

    return result;
}