7. Miscellaneous Utilties

7.1. Getline

The Sorg parser parses a file one line at a time.

Because the getline function is not part of the ANSI C standard, an implementation is used in it's place.

size_t sorg_getline(char **lineptr, size_t *n, FILE *stream) {
    char *bufptr = NULL;
    char *p = bufptr;
    size_t size;
    int c;

    if (lineptr == NULL) {
        return -1;
    }
    if (stream == NULL) {
        return -1;
    }
    if (n == NULL) {
        return -1;
    }
    bufptr = *lineptr;
    size = *n;

    c = fgetc(stream);
    if (c == EOF) {
        return -1;
    }
    if (bufptr == NULL) {
        bufptr = malloc(128);
        if (bufptr == NULL) {
            return -1;
        }
        size = 128;
    }
    p = bufptr;
    while(c != EOF) {
        if ((p - bufptr) > (size - 1)) {
            size = size + 128;
            bufptr = realloc(bufptr, size);
            if (bufptr == NULL) {
                return -1;
            }
        }
        *p++ = c;
        if (c == '\n') {
            break;
        }
        c = fgetc(stream);
    }


    *lineptr = bufptr;

    /* Some text editors do not insert a linebreak on the last line.
    * For these cases, shift everything by 1.
    */

    if(c == EOF) {
        p = p + 1;
        size += 1;
    }
    *p++ = '\0';
    *n = size;

    return p - bufptr - 1;
}

7.2. Spaces To Underscores

As it turns out, some browsers, such as netsurf, don't work well when references have spaces in them. This function will take in a string and write it to a file handle, replacing the spaces ( ) to underscores (_).

static void spaces_to_underscores(const char *str, size_t size, FILE *out);

static void spaces_to_underscores(const char *str, size_t size, FILE *out)
{
    size_t blksize;
    size_t n;
    size_t off;

    off = 0;
    blksize = 0;

    for(n = 0; n < size; n++) {
        blksize++;
        if(str[n] == ' ') {
            fwrite(str + off, 1, blksize - 1, out);
            fputc('_', out);
            blksize = 0;
            off = n + 1;
        }
    }

    fwrite(str + off, 1, blksize, out);
}

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