?? getpwent.c
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#include <stdio.h>#include <pwd.h>static char PASSWD[] = "/etc/passwd";static char EMPTY[] = "";static FILE *pwf = NULL;static char line[BUFSIZ+1];static struct passwd passwd;setpwent(){ if( pwf == NULL ) pwf = fopen( PASSWD, "r" ); else rewind( pwf );}endpwent(){ if( pwf != NULL ){ fclose( pwf ); pwf = NULL; }}static char *pwskip(p)register char *p;{ while( *p && *p != ':' ) ++p; if( *p ) *p++ = 0; return(p);}struct passwd *getpwent(){ register char *p; if (pwf == NULL) { if( (pwf = fopen( PASSWD, "r" )) == NULL ) return(0); } p = fgets(line, BUFSIZ, pwf); if (p==NULL) return(0); passwd.pw_name = p; p = pwskip(p); passwd.pw_passwd = p; p = pwskip(p); passwd.pw_uid = atoi(p); p = pwskip(p); passwd.pw_gid = atoi(p); passwd.pw_quota = 0; passwd.pw_comment = EMPTY; p = pwskip(p); passwd.pw_gecos = p; p = pwskip(p); passwd.pw_dir = p; p = pwskip(p); passwd.pw_shell = p; while(*p && *p != '\n') p++; *p = '\0'; return(&passwd);}?? 快捷鍵說明
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