github.com/afumu/libc@v0.0.6/musl/src/passwd/getpw_r.c (about)

     1  #include "pwf.h"
     2  #include <pthread.h>
     3  
     4  #define FIX(x) (pw->pw_##x = pw->pw_##x-line+buf)
     5  
     6  static int getpw_r(const char *name, uid_t uid, struct passwd *pw, char *buf, size_t size, struct passwd **res)
     7  {
     8  	char *line = 0;
     9  	size_t len = 0;
    10  	int rv = 0;
    11  	int cs;
    12  
    13  	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
    14  
    15  	rv = __getpw_a(name, uid, pw, &line, &len, res);
    16  	if (*res && size < len) {
    17  		*res = 0;
    18  		rv = ERANGE;
    19  	}
    20  	if (*res) {
    21  		memcpy(buf, line, len);
    22  		FIX(name);
    23  		FIX(passwd);
    24  		FIX(gecos);
    25  		FIX(dir);
    26  		FIX(shell);
    27  	}
    28   	free(line);
    29  	pthread_setcancelstate(cs, 0);
    30  	if (rv) errno = rv;
    31  	return rv;
    32  }
    33  
    34  int getpwnam_r(const char *name, struct passwd *pw, char *buf, size_t size, struct passwd **res)
    35  {
    36  	return getpw_r(name, 0, pw, buf, size, res);
    37  }
    38  
    39  int getpwuid_r(uid_t uid, struct passwd *pw, char *buf, size_t size, struct passwd **res)
    40  {
    41  	return getpw_r(0, uid, pw, buf, size, res);
    42  }