[Rpm-maint] [rpm-software-management/rpm] Is there any proper documentation with examples for librpm 6.x? (Discussion #4168)

[3millionminds]

Not ideal, but thanks.

Here's a full example for anyone else looking for a pure C implementation.
May not be 100% correct since C isn't my thing exactly but it works just like `rpm -qa` would.

```c
#include <rpm/rpmts.h>
#include <rpm/rpmdb.h>
// #include <rpm/header.h>
#include <rpm/rpmcli.h>
#include <stdio.h>
#include <fcntl.h>

int main(void)
{
    
    rpmReadConfigFiles(NULL, NULL);
    rpmts ts = rpmtsCreate();
    if (!ts) {
        fprintf(stderr, "Failed to create rpmts\n");
        return 1;
    }

    /* Open DB in read-only mode */
    if (rpmtsOpenDB(ts, O_RDONLY) != 0) {
        fprintf(stderr, "Failed to open RPM database\n");
        rpmtsFree(ts);
        return 1;
    }

    /* NULL keyp == sequential iteration over all installed packages */
    rpmdbMatchIterator mi = rpmtsInitIterator(ts, RPMDBI_PACKAGES, NULL, 0);
    if (!mi) {
        fprintf(stderr, "Failed to create match iterator\n");
        rpmtsFree(ts);
        return 1;
    }

    Header h;
    while ((h = rpmdbNextIterator(mi)) != NULL) {
        const char *name = headerGetString(h, RPMTAG_NAME);
        const char *epoch = headerGetString(h, RPMTAG_EPOCH);
        const char *version = headerGetString(h, RPMTAG_VERSION);
        const char *release = headerGetString(h, RPMTAG_RELEASE);

        if (name && version && release)
            printf("%s-%s-%s-%s\n", name, epoch, version, release);
    }

    /* Cleanup */
    rpmdbFreeIterator(mi);
    rpmtsFree(ts);

    return 0;
}
```

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