src/lib-imap/imap-seqset.c

/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "imap-seqset.h"

static uint32_t get_next_number(const char **str)
{
    uint32_t num;

    num = 0;
    while (**str != '\0') {
        if (**str < '0' || **str > '9')
            break;

        num = num*10 + (**str - '0');
        (*str)++;
    }

    if (num == (uint32_t)-1) {
        /* FIXME: ugly hack, we're using this number to mean the
           last existing message. In reality UIDs should never get
           this high, so we can quite safely just drop this one down. */
        num--;
    }

    return num;
}

static int
get_next_seq_range(const char **str, uint32_t *seq1_r, uint32_t *seq2_r)
{
    uint32_t seq1, seq2;

    if (**str == '*') {
        /* last message */
        seq1 = (uint32_t)-1;
        *str += 1;
    } else {
        seq1 = get_next_number(str);
        if (seq1 == 0)
            return -1;
    }

    if (**str != ':')
        seq2 = seq1;
    else {
        /* first:last range */
        *str += 1;

        if (**str == '*') {
            seq2 = (uint32_t)-1;
            *str += 1;
        } else {
            seq2 = get_next_number(str);
            if (seq2 == 0)
                return -1;
        }
    }

    if (seq1 > seq2) {
        /* swap, as specified by RFC-3501 */
        *seq1_r = seq2;
        *seq2_r = seq1;
    } else {
        *seq1_r = seq1;
        *seq2_r = seq2;
    }
    return 0;
}

int imap_seq_set_parse(const char *str, ARRAY_TYPE(seq_range) *dest)
{
    uint32_t seq1, seq2;

    while (*str != '\0') {
        if (get_next_seq_range(&str, &seq1, &seq2) < 0)
            return -1;
        seq_range_array_add_range(dest, seq1, seq2);

        if (*str == ',')
            str++;
        else if (*str != '\0')
            return -1;
    }
    return 0;
}

int imap_seq_set_nostar_parse(const char *str, ARRAY_TYPE(seq_range) *dest)
{
    if (imap_seq_set_parse(str, dest) < 0)
        return -1;

    if (seq_range_exists(dest, (uint32_t)-1)) {
        /* '*' used */
        return -1;
    }
    return 0;
}

int imap_seq_range_parse(const char *str, uint32_t *seq1_r, uint32_t *seq2_r)
{
    if (get_next_seq_range(&str, seq1_r, seq2_r) < 0)
        return -1;
    return *str == '\0' ? 0 : -1;
}