strlist.c

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/*
 * (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
 *
 * Licensed under the GPLv2.
 */

#include "strlist.h"
#include "util.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static
struct rb_node *strlist__node_new(struct rblist *rblist, const void *entry)
{
    const char *s = entry;
    struct rb_node *rc = NULL;
    struct strlist *strlist = container_of(rblist, struct strlist, rblist);
    struct str_node *snode = malloc(sizeof(*snode));

    if (snode != NULL) {
        if (strlist->dupstr) {
            s = strdup(s);
            if (s == NULL)
                goto out_delete;
        }
        snode->s = s;
        rc = &snode->rb_node;
    }

    return rc;

out_delete:
    free(snode);
    return NULL;
}

static void str_node__delete(struct str_node *snode, bool dupstr)
{
    if (dupstr)
        zfree((char **)&snode->s);
    free(snode);
}

static
void strlist__node_delete(struct rblist *rblist, struct rb_node *rb_node)
{
    struct strlist *slist = container_of(rblist, struct strlist, rblist);
    struct str_node *snode = container_of(rb_node, struct str_node, rb_node);

    str_node__delete(snode, slist->dupstr);
}

static int strlist__node_cmp(struct rb_node *rb_node, const void *entry)
{
    const char *str = entry;
    struct str_node *snode = container_of(rb_node, struct str_node, rb_node);

    return strcmp(snode->s, str);
}

int strlist__add(struct strlist *slist, const char *new_entry)
{
    return rblist__add_node(&slist->rblist, new_entry);
}

int strlist__load(struct strlist *slist, const char *filename)
{
    char entry[1024];
    int err;
    FILE *fp = fopen(filename, "r");

    if (fp == NULL)
        return -errno;

    while (fgets(entry, sizeof(entry), fp) != NULL) {
        const size_t len = strlen(entry);

        if (len == 0)
            continue;
        entry[len - 1] = '\0';

        err = strlist__add(slist, entry);
        if (err != 0)
            goto out;
    }

    err = 0;
out:
    fclose(fp);
    return err;
}

void strlist__remove(struct strlist *slist, struct str_node *snode)
{
    rblist__remove_node(&slist->rblist, &snode->rb_node);
}

struct str_node *strlist__find(struct strlist *slist, const char *entry)
{
    struct str_node *snode = NULL;
    struct rb_node *rb_node = rblist__find(&slist->rblist, entry);

    if (rb_node)
        snode = container_of(rb_node, struct str_node, rb_node);

    return snode;
}

static int strlist__parse_list_entry(struct strlist *slist, const char *s,
                     const char *subst_dir)
{
    int err;
    char *subst = NULL;

    if (strncmp(s, "file://", 7) == 0)
        return strlist__load(slist, s + 7);

    if (subst_dir) {
        err = -ENOMEM;
        if (asprintf(&subst, "%s/%s", subst_dir, s) < 0)
            goto out;

        if (access(subst, F_OK) == 0) {
            err = strlist__load(slist, subst);
            goto out;
        }

        if (slist->file_only) {
            err = -ENOENT;
            goto out;
        }
    }

    err = strlist__add(slist, s);
out:
    free(subst);
    return err;
}

static int strlist__parse_list(struct strlist *slist, const char *s, const char *subst_dir)
{
    char *sep;
    int err;

    while ((sep = strchr(s, ',')) != NULL) {
        *sep = '\0';
        err = strlist__parse_list_entry(slist, s, subst_dir);
        *sep = ',';
        if (err != 0)
            return err;
        s = sep + 1;
    }

    return *s ? strlist__parse_list_entry(slist, s, subst_dir) : 0;
}

struct strlist *strlist__new(const char *list, const struct strlist_config *config)
{
    struct strlist *slist = malloc(sizeof(*slist));

    if (slist != NULL) {
        bool dupstr = true;
        bool file_only = false;
        const char *dirname = NULL;

        if (config) {
            dupstr = !config->dont_dupstr;
            dirname = config->dirname;
            file_only = config->file_only;
        }

        rblist__init(&slist->rblist);
        slist->rblist.node_cmp    = strlist__node_cmp;
        slist->rblist.node_new    = strlist__node_new;
        slist->rblist.node_delete = strlist__node_delete;

        slist->dupstr    = dupstr;
        slist->file_only = file_only;

        if (list && strlist__parse_list(slist, list, dirname) != 0)
            goto out_error;
    }

    return slist;
out_error:
    free(slist);
    return NULL;
}

void strlist__delete(struct strlist *slist)
{
    if (slist != NULL)
        rblist__delete(&slist->rblist);
}

struct str_node *strlist__entry(const struct strlist *slist, unsigned int idx)
{
    struct str_node *snode = NULL;
    struct rb_node *rb_node;

    rb_node = rblist__entry(&slist->rblist, idx);
    if (rb_node)
        snode = container_of(rb_node, struct str_node, rb_node);

    return snode;
}