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examples: improve global init, error checks and returning errors

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- add `curl_global_init()` and `curl_global_cleanup()` where missing.
- check the result of `curl_global_init()` where missing.
- return the last curl error from `main()`.
- drop Win32-specific socket initialization in favor of `curl_global_init()`.
- rename some outliers to `res` for curl result code.
- fix cleanup in some error cases.

Inspired by Joshua's report on examples.

Closes #19053
This commit is contained in:
Viktor Szakats 2025-10-13 16:30:18 +02:00
parent 3049c8e0a0
commit 4c7507daf9
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GPG key ID: B5ABD165E2AEF201
129 changed files with 990 additions and 485 deletions
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87
docs/examples/htmltidy.c
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@ -76,55 +76,58 @@ void dumpNode(TidyDoc doc, TidyNode tnod, int indent)
int main(int argc, char **argv)
{
if(argc == 2) {
CURL *curl;
char curl_errbuf[CURL_ERROR_SIZE];
TidyDoc tdoc;
TidyBuffer docbuf = {0};
TidyBuffer tidy_errbuf = {0};
int err;
CURL *curl;
char curl_errbuf[CURL_ERROR_SIZE];
TidyDoc tdoc;
TidyBuffer docbuf = {0};
TidyBuffer tidy_errbuf = {0};
CURLcode res;
curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errbuf);
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb);
if(argc != 2) {
printf("usage: %s <url>\n", argv[0]);
return 1;
}
tdoc = tidyCreate();
tidyOptSetBool(tdoc, TidyForceOutput, yes); /* try harder */
tidyOptSetInt(tdoc, TidyWrapLen, 4096);
tidySetErrorBuffer(tdoc, &tidy_errbuf);
tidyBufInit(&docbuf);
res = curl_global_init(CURL_GLOBAL_ALL);
if(res)
return (int)res;
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &docbuf);
err = curl_easy_perform(curl);
if(!err) {
err = tidyParseBuffer(tdoc, &docbuf); /* parse the input */
if(err >= 0) {
err = tidyCleanAndRepair(tdoc); /* fix any problems */
if(err >= 0) {
err = tidyRunDiagnostics(tdoc); /* load tidy error buffer */
if(err >= 0) {
dumpNode(tdoc, tidyGetRoot(tdoc), 0); /* walk the tree */
fprintf(stderr, "%s\n", tidy_errbuf.bp); /* show errors */
}
curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errbuf);
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb);
tdoc = tidyCreate();
tidyOptSetBool(tdoc, TidyForceOutput, yes); /* try harder */
tidyOptSetInt(tdoc, TidyWrapLen, 4096);
tidySetErrorBuffer(tdoc, &tidy_errbuf);
tidyBufInit(&docbuf);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &docbuf);
res = curl_easy_perform(curl);
if(!res) {
res = tidyParseBuffer(tdoc, &docbuf); /* parse the input */
if(res >= 0) {
res = tidyCleanAndRepair(tdoc); /* fix any problems */
if(res >= 0) {
res = tidyRunDiagnostics(tdoc); /* load tidy error buffer */
if(res >= 0) {
dumpNode(tdoc, tidyGetRoot(tdoc), 0); /* walk the tree */
fprintf(stderr, "%s\n", tidy_errbuf.bp); /* show errors */
}
}
}
else
fprintf(stderr, "%s\n", curl_errbuf);
/* clean-up */
curl_easy_cleanup(curl);
tidyBufFree(&docbuf);
tidyBufFree(&tidy_errbuf);
tidyRelease(tdoc);
return err;
}
else
printf("usage: %s <url>\n", argv[0]);
fprintf(stderr, "%s\n", curl_errbuf);
return 0;
/* clean-up */
curl_easy_cleanup(curl);
curl_global_cleanup();
tidyBufFree(&docbuf);
tidyBufFree(&tidy_errbuf);
tidyRelease(tdoc);
return (int)res;
}