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/**
* Display the list of re-exported libraries from a TAPI v2 .tbd file, one per
* line on stdout.
*
* TAPI files are the equivalent of library files for the purposes of linking.
* Like dylib files, they may re-export other libraries. In upstream usage
* these refer to the absolute paths of dylibs, and are resolved to .tbd files
* in combination with the syslibroot option. In nixpkgs, the .tbd files refer
* directly to other .tbd files without a syslibroot. Note that each .tbd file
* contains an install name, so the re-exported path does not affect the final
* result.
*
* In nixpkgs each framework is a distinct store path and some frameworks
* re-export other frameworks. The re-exported names are rewritten to refer to
* the store paths of dependencies via textual substitution. This utility is
* used to emit every file that is listed as a re-exported library, which
* allows the framework builder to verify their existence.
*/
#include <stdio.h>
#include <sys/errno.h>
#include <yaml.h>
#define LOG(str, ...) fprintf(stderr, "%s", str)
#define LOGF(...) fprintf(stderr, __VA_ARGS__)
static yaml_node_t *get_mapping_entry(yaml_document_t *document, yaml_node_t *mapping, const char *name) {
if (!mapping) {
fprintf(stderr, "get_mapping_entry: mapping is null\n");
return NULL;
}
for (
yaml_node_pair_t *pair = mapping->data.mapping.pairs.start;
pair < mapping->data.mapping.pairs.top;
++pair
) {
yaml_node_t *key = yaml_document_get_node(document, pair->key);
if (!key) {
LOGF("key (%d) is null\n", pair->key);
return NULL;
}
if (key->type != YAML_SCALAR_NODE) {
LOG("get_mapping_entry: key is not a scalar\n");
return NULL;
}
if (strncmp((const char *)key->data.scalar.value, name, key->data.scalar.length) != 0) {
continue;
}
return yaml_document_get_node(document, pair->value);
}
return NULL;
}
static int emit_reexports_v2(yaml_document_t *document) {
yaml_node_t *root = yaml_document_get_root_node(document);
yaml_node_t *exports = get_mapping_entry(document, root, "exports");
if (!exports) {
return 1;
}
if (exports->type != YAML_SEQUENCE_NODE) {
LOG("value is not a sequence\n");
return 0;
}
for (
yaml_node_item_t *export = exports->data.sequence.items.start;
export < exports->data.sequence.items.top;
++export
) {
yaml_node_t *export_node = yaml_document_get_node(document, *export);
yaml_node_t *reexports = get_mapping_entry(document, export_node, "re-exports");
if (!reexports) {
continue;
}
if (reexports->type != YAML_SEQUENCE_NODE) {
LOG("re-exports is not a sequence\n");
return 0;
}
for (
yaml_node_item_t *reexport = reexports->data.sequence.items.start;
reexport < reexports->data.sequence.items.top;
++reexport
) {
yaml_node_t *val = yaml_document_get_node(document, *reexport);
if (val->type != YAML_SCALAR_NODE) {
LOG("item is not a scalar\n");
return 0;
}
fwrite(val->data.scalar.value, val->data.scalar.length, 1, stdout);
putchar('\n');
}
}
return 1;
}
static int emit_reexports_v4(yaml_document_t *document) {
yaml_node_t *root = yaml_document_get_root_node(document);
yaml_node_t *reexports = get_mapping_entry(document, root, "reexported-libraries");
if (!reexports) {
return 1;
}
if (reexports->type != YAML_SEQUENCE_NODE) {
LOG("value is not a sequence\n");
return 0;
}
for (
yaml_node_item_t *entry = reexports->data.sequence.items.start;
entry < reexports->data.sequence.items.top;
++entry
) {
yaml_node_t *entry_node = yaml_document_get_node(document, *entry);
yaml_node_t *libs = get_mapping_entry(document, entry_node, "libraries");
if (!libs) {
continue;
}
if (libs->type != YAML_SEQUENCE_NODE) {
LOG("libraries is not a sequence\n");
return 0;
}
for (
yaml_node_item_t *lib = libs->data.sequence.items.start;
lib < libs->data.sequence.items.top;
++lib
) {
yaml_node_t *val = yaml_document_get_node(document, *lib);
if (val->type != YAML_SCALAR_NODE) {
LOG("item is not a scalar\n");
return 0;
}
fwrite(val->data.scalar.value, val->data.scalar.length, 1, stdout);
putchar('\n');
}
}
return 1;
}
int main(int argc, char **argv) {
int result = 0;
if (argc != 2) {
fprintf(stderr, "Invalid usage\n");
result = 2;
goto done;
}
FILE *f = fopen(argv[1], "r");
if (!f) {
perror("opening input file");
result = errno;
goto done;
}
yaml_parser_t yaml_parser;
if (!yaml_parser_initialize(&yaml_parser)) {
fprintf(stderr, "Failed to initialize yaml parser\n");
result = 1;
goto err_file;
}
yaml_parser_set_input_file(&yaml_parser, f);
yaml_document_t yaml_document;
if(!yaml_parser_load(&yaml_parser, &yaml_document)) {
fprintf(stderr, "Failed to load yaml file\n");
result = 1;
goto err_yaml;
}
// Try both, only fail if one reports an error. A lack of re-exports is not
// considered an error.
int ok = 1;
ok = ok && emit_reexports_v2(&yaml_document);
ok = ok && emit_reexports_v4(&yaml_document);
result = !ok;
err_yaml:
yaml_parser_delete(&yaml_parser);
err_file:
fclose(f);
done:
return result;
}
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