third_party/ulib/musl/src/passwd/getpwent_a.c

#include "pwf.h"

static unsigned atou(char** s) {
    unsigned x;
    for (x = 0; **s - '0' < 10U; ++*s)
        x = 10 * x + (**s - '0');
    return x;
}

int __getpwent_a(FILE* f, struct passwd* pw, char** line, size_t* size, struct passwd** res) {
    ssize_t l;
    char* s;
    int rv = 0;
    for (;;) {
        if ((l = getline(line, size, f)) < 0) {
            rv = ferror(f) ? errno : 0;
            free(*line);
            *line = 0;
            pw = 0;
            break;
        }
        line[0][l - 1] = 0;

        s = line[0];
        pw->pw_name = s++;
        if (!(s = strchr(s, ':')))
            continue;

        *s++ = 0;
        pw->pw_passwd = s;
        if (!(s = strchr(s, ':')))
            continue;

        *s++ = 0;
        pw->pw_uid = atou(&s);
        if (*s != ':')
            continue;

        *s++ = 0;
        pw->pw_gid = atou(&s);
        if (*s != ':')
            continue;

        *s++ = 0;
        pw->pw_gecos = s;
        if (!(s = strchr(s, ':')))
            continue;

        *s++ = 0;
        pw->pw_dir = s;
        if (!(s = strchr(s, ':')))
            continue;

        *s++ = 0;
        pw->pw_shell = s;
        break;
    }
    *res = pw;
    if (rv)
        errno = rv;
    return rv;
}