lines_diff.c

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// SPDX-FileCopyrightText: 2021 RizinOrg <info@rizin.re>
// SPDX-FileCopyrightText: 2021 deroad <wargio@libero.it>
// SPDX-License-Identifier: LGPL-3.0-only
 
/* Helpers for handling lines */
#define DIFF_IS_LINES_METHOD(x) (x.elem_at == methods_lines.elem_at)
 
static RzList *tokenize_lines(const char *string) {
    RzList *lines = NULL;
    size_t last = 0;
    size_t size = 0;
    char *line = NULL;
 
    lines = rz_list_newf((RzListFree)free);
    if (!lines) {
        RZ_LOG_ERROR("rz_diff_line_new: cannot allocate list of lines\n");
        goto tokenize_newlines_fail;
    }
 
    size = strlen(string);
    for (size_t i = 0; i < size; ++i) {
        if (string[i] == '\n') {
            line = rz_str_ndup(string + last, (i + 1) - last);
            if (!line || !rz_list_append(lines, line)) {
                RZ_LOG_ERROR("rz_diff_line_new: cannot allocate line or add it to the list\n");
                free(line);
                goto tokenize_newlines_fail;
            }
            last = i + 1;
        }
    }
 
    if (last < size) {
        line = rz_str_ndup(string + last, size - last);
        if (!line || !rz_list_append(lines, line)) {
            RZ_LOG_ERROR("rz_diff_line_new: cannot allocate last line or add it to the list\n");
            free(line);
            goto tokenize_newlines_fail;
        }
    }
 
    return lines;
 
tokenize_newlines_fail:
    rz_list_free(lines);
    return NULL;
}
 
static const void *line_elem_at(const RzList *array, ut32 index) {
    return rz_list_get_n(array, index);
}
 
static int line_compare(const char *a_elem, const char *b_elem) {
    return strcmp(a_elem, b_elem);
}
 
static ut32 line_hash(const char *elem) {
    ut32 size = strlen(elem);
    return rz_diff_hash_data((const ut8 *)elem, size);
}
 
static void line_stringify(const char *a_elem, RzStrBuf *sb) {
    rz_strbuf_set(sb, a_elem);
}
 
static void line_free(RzList *array) {
    rz_list_free(array);
}
 
static const MethodsInternal methods_lines = {
    .elem_at /*  */ = (RzDiffMethodElemAt)line_elem_at,
    .elem_hash  = (RzDiffMethodElemHash)line_hash,
    .compare /*  */ = (RzDiffMethodCompare)line_compare,
    .stringify  = (RzDiffMethodStringify)line_stringify,
    .ignore /*   */ = fake_ignore,
    .free /*     */ = (RzDiffMethodFree)line_free,
};