Adding upstream version 2.1.30.upstream/2.1.30upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 773 insertions, 0 deletions

diff --git a/src/log.c b/src/log.c
new file mode 100644
index 0000000..2a1f862
--- /dev/null
+++ b/src/log.c
@@ -0,0 +1,773 @@
+/**
+ * @file log.c
+ * @author Radek Krejci <rkrejci@cesnet.cz>
+ * @author Michal Vasko <mvasko@cesnet.cz>
+ * @brief Logger routines implementations
+ *
+ * Copyright (c) 2015 - 2022 CESNET, z.s.p.o.
+ *
+ * This source code is licensed under BSD 3-Clause License (the "License").
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://opensource.org/licenses/BSD-3-Clause
+ */
+
+#define _GNU_SOURCE /* asprintf, strdup */
+
+#include "log.h"
+
+#include <assert.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "common.h"
+#include "compat.h"
+#include "in_internal.h"
+#include "plugins_exts.h"
+#include "set.h"
+#include "tree_data.h"
+#include "tree_data_internal.h"
+#include "tree_schema.h"
+#include "tree_schema_internal.h"
+
+ATOMIC_T ly_ll = (uint_fast32_t)LY_LLWRN;
+ATOMIC_T ly_log_opts = (uint_fast32_t)(LY_LOLOG | LY_LOSTORE_LAST);
+THREAD_LOCAL uint32_t *temp_ly_log_opts;
+static ly_log_clb log_clb;
+static ATOMIC_T path_flag = 1;
+#ifndef NDEBUG
+ATOMIC_T ly_ldbg_groups = 0;
+#endif
+
+THREAD_LOCAL struct ly_log_location_s log_location = {0};
+
+/* how many bytes add when enlarging buffers */
+#define LY_BUF_STEP 128
+
+LIBYANG_API_DEF LY_ERR
+ly_errcode(const struct ly_ctx *ctx)
+{
+    struct ly_err_item *i;
+
+    i = ly_err_last(ctx);
+    if (i) {
+        return i->no;
+    }
+
+    return LY_SUCCESS;
+}
+
+LIBYANG_API_DEF LY_VECODE
+ly_vecode(const struct ly_ctx *ctx)
+{
+    struct ly_err_item *i;
+
+    i = ly_err_last(ctx);
+    if (i) {
+        return i->vecode;
+    }
+
+    return LYVE_SUCCESS;
+}
+
+LIBYANG_API_DEF const char *
+ly_errmsg(const struct ly_ctx *ctx)
+{
+    struct ly_err_item *i;
+
+    LY_CHECK_ARG_RET(NULL, ctx, NULL);
+
+    i = ly_err_last(ctx);
+    if (i) {
+        return i->msg;
+    }
+
+    return NULL;
+}
+
+LIBYANG_API_DEF const char *
+ly_errpath(const struct ly_ctx *ctx)
+{
+    struct ly_err_item *i;
+
+    LY_CHECK_ARG_RET(NULL, ctx, NULL);
+
+    i = ly_err_last(ctx);
+    if (i) {
+        return i->path;
+    }
+
+    return NULL;
+}
+
+LIBYANG_API_DEF const char *
+ly_errapptag(const struct ly_ctx *ctx)
+{
+    struct ly_err_item *i;
+
+    LY_CHECK_ARG_RET(NULL, ctx, NULL);
+
+    i = ly_err_last(ctx);
+    if (i) {
+        return i->apptag;
+    }
+
+    return NULL;
+}
+
+LIBYANG_API_DEF LY_ERR
+ly_err_new(struct ly_err_item **err, LY_ERR ecode, LY_VECODE vecode, char *path, char *apptag, const char *err_format, ...)
+{
+    char *msg = NULL;
+    struct ly_err_item *e;
+
+    if (!err || (ecode == LY_SUCCESS)) {
+        /* nothing to do */
+        return ecode;
+    }
+
+    e = malloc(sizeof *e);
+    LY_CHECK_ERR_RET(!e, LOGMEM(NULL), LY_EMEM);
+    e->prev = (*err) ? (*err)->prev : e;
+    e->next = NULL;
+    if (*err) {
+        (*err)->prev->next = e;
+    }
+
+    /* fill in the information */
+    e->level = LY_LLERR;
+    e->no = ecode;
+    e->vecode = vecode;
+    e->path = path;
+    e->apptag = apptag;
+
+    if (err_format) {
+        va_list print_args;
+
+        va_start(print_args, err_format);
+
+        if (vasprintf(&msg, err_format, print_args) == -1) {
+            /* we don't have anything more to do, just set msg to NULL to avoid undefined content,
+             * still keep the information about the original error instead of LY_EMEM or other printf's error */
+            msg = NULL;
+        }
+
+        va_end(print_args);
+    }
+    e->msg = msg;
+
+    if (!(*err)) {
+        *err = e;
+    }
+
+    return e->no;
+}
+
+LIBYANG_API_DEF struct ly_err_item *
+ly_err_first(const struct ly_ctx *ctx)
+{
+    LY_CHECK_ARG_RET(NULL, ctx, NULL);
+
+    return pthread_getspecific(ctx->errlist_key);
+}
+
+LIBYANG_API_DEF struct ly_err_item *
+ly_err_last(const struct ly_ctx *ctx)
+{
+    const struct ly_err_item *e;
+
+    LY_CHECK_ARG_RET(NULL, ctx, NULL);
+
+    e = pthread_getspecific(ctx->errlist_key);
+    return e ? e->prev : NULL;
+}
+
+LIBYANG_API_DEF void
+ly_err_free(void *ptr)
+{
+    struct ly_err_item *i, *next;
+
+    /* clean the error list */
+    for (i = (struct ly_err_item *)ptr; i; i = next) {
+        next = i->next;
+        free(i->msg);
+        free(i->path);
+        free(i->apptag);
+        free(i);
+    }
+}
+
+LIBYANG_API_DEF void
+ly_err_clean(struct ly_ctx *ctx, struct ly_err_item *eitem)
+{
+    struct ly_err_item *i, *first;
+
+    first = ly_err_first(ctx);
+    if (first == eitem) {
+        eitem = NULL;
+    }
+    if (eitem) {
+        /* disconnect the error */
+        for (i = first; i && (i->next != eitem); i = i->next) {}
+        assert(i);
+        i->next = NULL;
+        first->prev = i;
+        /* free this err and newer */
+        ly_err_free(eitem);
+    } else {
+        /* free all err */
+        ly_err_free(first);
+        pthread_setspecific(ctx->errlist_key, NULL);
+    }
+}
+
+LIBYANG_API_DEF LY_LOG_LEVEL
+ly_log_level(LY_LOG_LEVEL level)
+{
+    LY_LOG_LEVEL prev = ATOMIC_LOAD_RELAXED(ly_ll);
+
+    ATOMIC_STORE_RELAXED(ly_ll, level);
+    return prev;
+}
+
+LIBYANG_API_DEF uint32_t
+ly_log_options(uint32_t opts)
+{
+    uint32_t prev = ATOMIC_LOAD_RELAXED(ly_log_opts);
+
+    ATOMIC_STORE_RELAXED(ly_log_opts, opts);
+    return prev;
+}
+
+LIBYANG_API_DEF void
+ly_temp_log_options(uint32_t *opts)
+{
+    temp_ly_log_opts = opts;
+}
+
+LIBYANG_API_DEF uint32_t
+ly_log_dbg_groups(uint32_t dbg_groups)
+{
+#ifndef NDEBUG
+    uint32_t prev = ATOMIC_LOAD_RELAXED(ly_ldbg_groups);
+
+    ATOMIC_STORE_RELAXED(ly_ldbg_groups, dbg_groups);
+    return prev;
+#else
+    (void)dbg_groups;
+    return 0;
+#endif
+}
+
+LIBYANG_API_DEF void
+ly_set_log_clb(ly_log_clb clb, ly_bool path)
+{
+    log_clb = clb;
+    ATOMIC_STORE_RELAXED(path_flag, path);
+}
+
+LIBYANG_API_DEF ly_log_clb
+ly_get_log_clb(void)
+{
+    return log_clb;
+}
+
+void
+ly_log_location(const struct lysc_node *scnode, const struct lyd_node *dnode, const char *path, const struct ly_in *in,
+        uint64_t line)
+{
+    if (scnode) {
+        ly_set_add(&log_location.scnodes, (void *)scnode, 1, NULL);
+    }
+    if (dnode) {
+        ly_set_add(&log_location.dnodes, (void *)dnode, 1, NULL);
+    }
+    if (path) {
+        char *s = strdup(path);
+
+        LY_CHECK_ERR_RET(!s, LOGMEM(NULL), );
+        ly_set_add(&log_location.paths, s, 1, NULL);
+    }
+    if (in) {
+        ly_set_add(&log_location.inputs, (void *)in, 1, NULL);
+    }
+    if (line) {
+        log_location.line = line;
+    }
+}
+
+void
+ly_log_location_revert(uint32_t scnode_steps, uint32_t dnode_steps, uint32_t path_steps, uint32_t in_steps)
+{
+    for (uint32_t i = scnode_steps; i && log_location.scnodes.count; i--) {
+        log_location.scnodes.count--;
+    }
+
+    for (uint32_t i = dnode_steps; i && log_location.dnodes.count; i--) {
+        log_location.dnodes.count--;
+    }
+
+    for (uint32_t i = path_steps; i && log_location.paths.count; i--) {
+        ly_set_rm_index(&log_location.paths, log_location.paths.count - 1, free);
+    }
+
+    for (uint32_t i = in_steps; i && log_location.inputs.count; i--) {
+        log_location.inputs.count--;
+    }
+
+    /* deallocate the empty sets */
+    if (scnode_steps && !log_location.scnodes.count) {
+        ly_set_erase(&log_location.scnodes, NULL);
+    }
+    if (dnode_steps && !log_location.dnodes.count) {
+        ly_set_erase(&log_location.dnodes, NULL);
+    }
+    if (path_steps && !log_location.paths.count) {
+        ly_set_erase(&log_location.paths, free);
+    }
+    if (in_steps && !log_location.inputs.count) {
+        ly_set_erase(&log_location.inputs, NULL);
+    }
+}
+
+static LY_ERR
+log_store(const struct ly_ctx *ctx, LY_LOG_LEVEL level, LY_ERR no, LY_VECODE vecode, char *msg, char *path, char *apptag)
+{
+    struct ly_err_item *eitem, *last;
+
+    assert(ctx && (level < LY_LLVRB));
+
+    eitem = pthread_getspecific(ctx->errlist_key);
+    if (!eitem) {
+        /* if we are only to fill in path, there must have been an error stored */
+        assert(msg);
+        eitem = malloc(sizeof *eitem);
+        LY_CHECK_GOTO(!eitem, mem_fail);
+        eitem->prev = eitem;
+        eitem->next = NULL;
+
+        pthread_setspecific(ctx->errlist_key, eitem);
+    } else if (!msg) {
+        /* only filling the path */
+        assert(path);
+
+        /* find last error */
+        eitem = eitem->prev;
+        do {
+            if (eitem->level == LY_LLERR) {
+                /* fill the path */
+                free(eitem->path);
+                eitem->path = path;
+                return LY_SUCCESS;
+            }
+            eitem = eitem->prev;
+        } while (eitem->prev->next);
+        /* last error was not found */
+        assert(0);
+    } else if ((temp_ly_log_opts && ((*temp_ly_log_opts & LY_LOSTORE_LAST) == LY_LOSTORE_LAST)) ||
+            (!temp_ly_log_opts && ((ATOMIC_LOAD_RELAXED(ly_log_opts) & LY_LOSTORE_LAST) == LY_LOSTORE_LAST))) {
+        /* overwrite last message */
+        free(eitem->msg);
+        free(eitem->path);
+        free(eitem->apptag);
+    } else {
+        /* store new message */
+        last = eitem->prev;
+        eitem->prev = malloc(sizeof *eitem);
+        LY_CHECK_GOTO(!eitem->prev, mem_fail);
+        eitem = eitem->prev;
+        eitem->prev = last;
+        eitem->next = NULL;
+        last->next = eitem;
+    }
+
+    /* fill in the information */
+    eitem->level = level;
+    eitem->no = no;
+    eitem->vecode = vecode;
+    eitem->msg = msg;
+    eitem->path = path;
+    eitem->apptag = apptag;
+    return LY_SUCCESS;
+
+mem_fail:
+    LOGMEM(NULL);
+    free(msg);
+    free(path);
+    free(apptag);
+    return LY_EMEM;
+}
+
+static void
+log_vprintf(const struct ly_ctx *ctx, LY_LOG_LEVEL level, LY_ERR no, LY_VECODE vecode, char *path, const char *apptag,
+        const char *format, va_list args)
+{
+    char *msg = NULL;
+    ly_bool free_strs, lolog, lostore;
+
+    /* learn effective logger options */
+    if (temp_ly_log_opts) {
+        lolog = *temp_ly_log_opts & LY_LOLOG;
+        lostore = *temp_ly_log_opts & LY_LOSTORE;
+    } else {
+        lolog = ATOMIC_LOAD_RELAXED(ly_log_opts) & LY_LOLOG;
+        lostore = ATOMIC_LOAD_RELAXED(ly_log_opts) & LY_LOSTORE;
+    }
+
+    if (level > ATOMIC_LOAD_RELAXED(ly_ll)) {
+        /* do not print or store the message */
+        free(path);
+        return;
+    }
+
+    if (no == LY_EMEM) {
+        /* just print it, anything else would most likely fail anyway */
+        if (lolog) {
+            if (log_clb) {
+                log_clb(level, LY_EMEM_MSG, path);
+            } else {
+                fprintf(stderr, "libyang[%d]: ", level);
+                vfprintf(stderr, format, args);
+                if (path) {
+                    fprintf(stderr, " (path: %s)\n", path);
+                } else {
+                    fprintf(stderr, "\n");
+                }
+            }
+        }
+        free(path);
+        return;
+    }
+
+    /* store the error/warning (if we need to store errors internally, it does not matter what are the user log options) */
+    if ((level < LY_LLVRB) && ctx && lostore) {
+        assert(format);
+        if (vasprintf(&msg, format, args) == -1) {
+            LOGMEM(ctx);
+            free(path);
+            return;
+        }
+        if (((no & ~LY_EPLUGIN) == LY_EVALID) && (vecode == LYVE_SUCCESS)) {
+            /* assume we are inheriting the error, so inherit vecode as well */
+            vecode = ly_vecode(ctx);
+        }
+        if (log_store(ctx, level, no, vecode, msg, path, apptag ? strdup(apptag) : NULL)) {
+            return;
+        }
+        free_strs = 0;
+    } else {
+        if (vasprintf(&msg, format, args) == -1) {
+            LOGMEM(ctx);
+            free(path);
+            return;
+        }
+        free_strs = 1;
+    }
+
+    /* if we are only storing errors internally, never print the message (yet) */
+    if (lolog) {
+        if (log_clb) {
+            log_clb(level, msg, path);
+        } else {
+            fprintf(stderr, "libyang[%d]: %s%s", level, msg, path ? " " : "\n");
+            if (path) {
+                fprintf(stderr, "(path: %s)\n", path);
+            }
+        }
+    }
+
+    if (free_strs) {
+        free(path);
+        free(msg);
+    }
+}
+
+#ifndef NDEBUG
+
+void
+ly_log_dbg(uint32_t group, const char *format, ...)
+{
+    char *dbg_format;
+    const char *str_group;
+    va_list ap;
+
+    if (!(ATOMIC_LOAD_RELAXED(ly_ldbg_groups) & group)) {
+        return;
+    }
+
+    switch (group) {
+    case LY_LDGDICT:
+        str_group = "DICT";
+        break;
+    case LY_LDGXPATH:
+        str_group = "XPATH";
+        break;
+    case LY_LDGDEPSETS:
+        str_group = "DEPSETS";
+        break;
+    default:
+        LOGINT(NULL);
+        return;
+    }
+
+    if (asprintf(&dbg_format, "%s: %s", str_group, format) == -1) {
+        LOGMEM(NULL);
+        return;
+    }
+
+    va_start(ap, format);
+    log_vprintf(NULL, LY_LLDBG, 0, 0, NULL, NULL, dbg_format, ap);
+    va_end(ap);
+}
+
+#endif
+
+void
+ly_log(const struct ly_ctx *ctx, LY_LOG_LEVEL level, LY_ERR no, const char *format, ...)
+{
+    va_list ap;
+
+    va_start(ap, format);
+    log_vprintf(ctx, level, no, 0, NULL, NULL, format, ap);
+    va_end(ap);
+}
+
+/**
+ * @brief Append a schema node name to a generated data path, only if it fits.
+ *
+ * @param[in,out] str Generated path to update.
+ * @param[in] snode Schema node to append.
+ * @param[in] parent Last printed data node.
+ * @return LY_ERR value.
+ */
+static LY_ERR
+ly_vlog_build_path_append(char **str, const struct lysc_node *snode, const struct lyd_node *parent)
+{
+    const struct lys_module *mod, *prev_mod;
+    uint32_t len, new_len;
+    void *mem;
+
+    if (snode->nodetype & (LYS_CHOICE | LYS_CASE)) {
+        /* schema-only node */
+        return LY_SUCCESS;
+    } else if (lysc_data_parent(snode) != parent->schema) {
+        /* not a direct descendant node */
+        return LY_SUCCESS;
+    }
+
+    /* get module to print, if any */
+    mod = snode->module;
+    prev_mod = (parent->schema) ? parent->schema->module : lyd_owner_module(parent);
+    if (prev_mod == mod) {
+        mod = NULL;
+    }
+
+    /* realloc string */
+    len = strlen(*str);
+    new_len = len + 1 + (mod ? strlen(mod->name) + 1 : 0) + strlen(snode->name);
+    mem = realloc(*str, new_len + 1);
+    LY_CHECK_ERR_RET(!mem, LOGMEM(LYD_CTX(parent)), LY_EMEM);
+    *str = mem;
+
+    /* print the last schema node */
+    sprintf(*str + len, "/%s%s%s", mod ? mod->name : "", mod ? ":" : "", snode->name);
+    return LY_SUCCESS;
+}
+
+/**
+ * @brief Build log path from the stored log location information.
+ *
+ * @param[in] ctx Context to use.
+ * @param[out] path Generated log path.
+ * @return LY_ERR value.
+ */
+static LY_ERR
+ly_vlog_build_path(const struct ly_ctx *ctx, char **path)
+{
+    int r;
+    char *str = NULL, *prev = NULL;
+    const struct lyd_node *dnode;
+
+    *path = NULL;
+
+    if (log_location.paths.count && ((const char *)(log_location.paths.objs[log_location.paths.count - 1]))[0]) {
+        /* simply get what is in the provided path string */
+        *path = strdup((const char *)log_location.paths.objs[log_location.paths.count - 1]);
+        LY_CHECK_ERR_RET(!(*path), LOGMEM(ctx), LY_EMEM);
+    } else {
+        /* data/schema node */
+        if (log_location.dnodes.count) {
+            dnode = log_location.dnodes.objs[log_location.dnodes.count - 1];
+            if (dnode->parent || !lysc_data_parent(dnode->schema)) {
+                /* data node with all of its parents */
+                str = lyd_path(log_location.dnodes.objs[log_location.dnodes.count - 1], LYD_PATH_STD, NULL, 0);
+                LY_CHECK_ERR_RET(!str, LOGMEM(ctx), LY_EMEM);
+            } else {
+                /* data parsers put all the parent nodes in the set, but they are not connected */
+                str = lyd_path_set(&log_location.dnodes, LYD_PATH_STD);
+                LY_CHECK_ERR_RET(!str, LOGMEM(ctx), LY_EMEM);
+            }
+
+            /* sometimes the last node is not created yet and we only have the schema node */
+            if (log_location.scnodes.count) {
+                ly_vlog_build_path_append(&str, log_location.scnodes.objs[log_location.scnodes.count - 1], dnode);
+            }
+
+            r = asprintf(path, "Data location \"%s\"", str);
+            free(str);
+            LY_CHECK_ERR_RET(r == -1, LOGMEM(ctx), LY_EMEM);
+        } else if (log_location.scnodes.count) {
+            str = lysc_path(log_location.scnodes.objs[log_location.scnodes.count - 1], LYSC_PATH_LOG, NULL, 0);
+            LY_CHECK_ERR_RET(!str, LOGMEM(ctx), LY_EMEM);
+
+            r = asprintf(path, "Schema location \"%s\"", str);
+            free(str);
+            LY_CHECK_ERR_RET(r == -1, LOGMEM(ctx), LY_EMEM);
+        }
+
+        /* line */
+        prev = *path;
+        if (log_location.line) {
+            r = asprintf(path, "%s%sine number %" PRIu64, prev ? prev : "", prev ? ", l" : "L", log_location.line);
+            free(prev);
+            LY_CHECK_ERR_RET(r == -1, LOGMEM(ctx), LY_EMEM);
+
+            log_location.line = 0;
+        } else if (log_location.inputs.count) {
+            r = asprintf(path, "%s%sine number %" PRIu64, prev ? prev : "", prev ? ", l" : "L",
+                    ((struct ly_in *)log_location.inputs.objs[log_location.inputs.count - 1])->line);
+            free(prev);
+            LY_CHECK_ERR_RET(r == -1, LOGMEM(ctx), LY_EMEM);
+        }
+
+        if (*path) {
+            prev = *path;
+            r = asprintf(path, "%s.", prev);
+            free(prev);
+            LY_CHECK_ERR_RET(r == -1, LOGMEM(ctx), LY_EMEM);
+        }
+    }
+
+    return LY_SUCCESS;
+}
+
+void
+ly_vlog(const struct ly_ctx *ctx, const char *apptag, LY_VECODE code, const char *format, ...)
+{
+    va_list ap;
+    char *path = NULL;
+
+    if (ATOMIC_LOAD_RELAXED(path_flag) && ctx) {
+        ly_vlog_build_path(ctx, &path);
+    }
+
+    va_start(ap, format);
+    log_vprintf(ctx, LY_LLERR, LY_EVALID, code, path, apptag, format, ap);
+    /* path is spent and should not be freed! */
+    va_end(ap);
+}
+
+/**
+ * @brief Print a log message from an extension plugin callback.
+ *
+ * @param[in] ctx libyang context to store the error record. If not provided, the error is just printed.
+ * @param[in] plugin_name Name of the plugin generating the message.
+ * @param[in] level Log message level (error, warning, etc.)
+ * @param[in] err_no Error type code.
+ * @param[in] path Optional path of the error.
+ * @param[in] format Format string to print.
+ * @param[in] ap Var arg list for @p format.
+ */
+static void
+ly_ext_log(const struct ly_ctx *ctx, const char *plugin_name, LY_LOG_LEVEL level, LY_ERR err_no, const char *path,
+        const char *format, va_list ap)
+{
+    char *plugin_msg;
+
+    if (ATOMIC_LOAD_RELAXED(ly_ll) < level) {
+        return;
+    }
+    if (asprintf(&plugin_msg, "Ext plugin \"%s\": %s", plugin_name, format) == -1) {
+        LOGMEM(ctx);
+        return;
+    }
+
+    log_vprintf(ctx, level, (level == LY_LLERR ? LY_EPLUGIN : 0) | err_no, LYVE_OTHER, path ? strdup(path) : NULL, NULL,
+            plugin_msg, ap);
+    free(plugin_msg);
+}
+
+LIBYANG_API_DEF void
+lyplg_ext_parse_log(const struct lysp_ctx *pctx, const struct lysp_ext_instance *ext, LY_LOG_LEVEL level, LY_ERR err_no,
+        const char *format, ...)
+{
+    va_list ap;
+    char *path = NULL;
+
+    if (ATOMIC_LOAD_RELAXED(path_flag)) {
+        ly_vlog_build_path(PARSER_CTX(pctx), &path);
+    }
+
+    va_start(ap, format);
+    ly_ext_log(PARSER_CTX(pctx), ext->record->plugin.id, level, err_no, path, format, ap);
+    va_end(ap);
+
+    free(path);
+}
+
+LIBYANG_API_DEF void
+lyplg_ext_compile_log(const struct lysc_ctx *cctx, const struct lysc_ext_instance *ext, LY_LOG_LEVEL level, LY_ERR err_no,
+        const char *format, ...)
+{
+    va_list ap;
+
+    va_start(ap, format);
+    ly_ext_log(ext->module->ctx, ext->def->plugin->id, level, err_no, cctx ? cctx->path : NULL, format, ap);
+    va_end(ap);
+}
+
+LIBYANG_API_DEF void
+lyplg_ext_compile_log_path(const char *path, const struct lysc_ext_instance *ext, LY_LOG_LEVEL level, LY_ERR err_no,
+        const char *format, ...)
+{
+    va_list ap;
+
+    va_start(ap, format);
+    ly_ext_log(ext->module->ctx, ext->def->plugin->id, level, err_no, path, format, ap);
+    va_end(ap);
+}
+
+/**
+ * @brief Exact same functionality as ::ly_err_print() but has variable arguments so log_vprintf() can be called.
+ */
+static void
+_ly_err_print(const struct ly_ctx *ctx, struct ly_err_item *eitem, const char *format, ...)
+{
+    va_list ap;
+    char *path_dup = NULL;
+
+    LY_CHECK_ARG_RET(ctx, eitem, );
+
+    if (eitem->path) {
+        /* duplicate path because it will be freed */
+        path_dup = strdup(eitem->path);
+        LY_CHECK_ERR_RET(!path_dup, LOGMEM(ctx), );
+    }
+
+    va_start(ap, format);
+    log_vprintf(ctx, eitem->level, eitem->no, eitem->vecode, path_dup, eitem->apptag, format, ap);
+    va_end(ap);
+}
+
+LIBYANG_API_DEF void
+ly_err_print(const struct ly_ctx *ctx, struct ly_err_item *eitem)
+{
+    /* String ::ly_err_item.msg cannot be used directly because it may contain the % character */
+    _ly_err_print(ctx, eitem, "%s", eitem->msg);
+}