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Annotation of coherent/b/lib/libc/gen/getpwent.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * libc/gen/getpwent.c
                      3:  * Coherent I/O Library.
                      4:  * Get password file entry.
                      5:  * Searches by next entry, name or numerical id.
                      6:  */
                      7: 
                      8: #include <stdio.h>
                      9: #include <pwd.h>
                     10: 
                     11: #define field(x)       { x=cp; while (*cp++); }
                     12: #define        NPWLINE 120
                     13: #define        PWFILE  "/etc/passwd"
                     14: 
                     15: static char    pwline[NPWLINE];
                     16: static struct  passwd pw;
                     17: static FILE    *pwfile = { NULL };
                     18: 
                     19: struct passwd *
                     20: getpwnam(name)
                     21: char *name;
                     22: {
                     23:        register struct passwd *pwp;
                     24: 
                     25:        setpwent();
                     26:        while ((pwp = getpwent()) != NULL)
                     27:                if (streq(name, pwp->pw_name))
                     28:                        return pwp;
                     29:        return NULL;
                     30: }
                     31: 
                     32: struct passwd *
                     33: getpwuid(uid)
                     34: {
                     35:        register struct passwd *pwp;
                     36: 
                     37:        setpwent();
                     38:        while ((pwp = getpwent()) != NULL)
                     39:                if (uid == pwp->pw_uid)
                     40:                        return pwp;
                     41:        return NULL;
                     42: }
                     43: 
                     44: struct passwd *
                     45: getpwent()
                     46: {
                     47:        register char *cp, *xp;
                     48:        register int c, nseps;
                     49: 
                     50:        if (pwfile == NULL)
                     51:                if ((pwfile = fopen(PWFILE, "r")) == NULL)
                     52:                        return NULL;
                     53: again:
                     54:        cp = pwline;
                     55:        for (nseps = 0; (c = getc(pwfile))!=EOF && c!='\n'; ) {
                     56:                if (c == ':') {
                     57:                        c = '\0';
                     58:                        ++nseps;
                     59:                }
                     60:                if (cp < &pwline[NPWLINE-1])
                     61:                        *cp++ = c;
                     62:        }
                     63:        if (c == EOF)
                     64:                return NULL;
                     65:        if (nseps != 6)
                     66:                goto again;             /* accept only lines with six ':'s */
                     67:        *cp = '\0';
                     68:        cp = pwline;
                     69:        field(pw.pw_name);
                     70:        field(pw.pw_passwd);
                     71:        field(xp);
                     72:        pw.pw_uid = atoi(xp);
                     73:        field(xp);
                     74:        pw.pw_gid = atoi(xp);
                     75:        field(pw.pw_comment);
                     76:        pw.pw_gecos = pw.pw_comment;
                     77:        field(pw.pw_dir);
                     78:        field(pw.pw_shell);
                     79:        return &pw;
                     80: }
                     81: 
                     82: setpwent()
                     83: {
                     84:        if (pwfile != NULL)
                     85:                rewind(pwfile);
                     86: }
                     87: 
                     88: endpwent()
                     89: {
                     90:        if (pwfile != NULL) {
                     91:                fclose(pwfile);
                     92:                pwfile = NULL;
                     93:        }
                     94: }
                     95: 
                     96: /* end of getpwent.c */

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