source: azure_iot_hub/trunk/musl-1.1.18/src/passwd/getpwent_a.c@ 389

#include "pwf.h"
#include <pthread.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;
        int cs;
        pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
        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;
        }
        pthread_setcancelstate(cs, 0);
        *res = pw;
        if (rv) errno = rv;
        return rv;
}