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35 #ident "$Id: sgetpwent.c 2581 2009-03-21 20:45:35Z nekral-guest $"
37 #include <sys/types.h>
41 #include "prototypes.h"
46 * sgetpwent - convert a string to a (struct passwd)
48 * sgetpwent() parses a string into the parts required for a password
49 * structure. Strict checking is made for the UID and GID fields and
50 * presence of the correct number of colons. Any failing tests result
51 * in a NULL pointer being returned.
53 * NOTE: This function uses hard-coded string scanning functions for
54 * performance reasons. I am going to come up with some conditional
55 * compilation glarp to improve on this in the future.
57 struct passwd *sgetpwent (const char *buf)
59 static struct passwd pwent;
60 static char pwdbuf[1024];
63 char *fields[NFIELDS];
66 * Copy the string to a static buffer so the pointers into
67 * the password structure remain valid.
70 if (strlen (buf) >= sizeof pwdbuf)
71 return 0; /* fail if too long */
75 * Save a pointer to the start of each colon separated
76 * field. The fields are converted into NUL terminated strings.
79 for (cp = pwdbuf, i = 0; (i < NFIELDS) && (NULL != cp); i++) {
81 while (('\0' != *cp) && (':' != *cp)) {
94 * There must be exactly NFIELDS colon separated fields or
95 * the entry is invalid. Also, the UID and GID must be non-blank.
98 if (i != NFIELDS || *fields[2] == '\0' || *fields[3] == '\0')
102 * Each of the fields is converted the appropriate data type
103 * and the result assigned to the password structure. If the
104 * UID or GID does not convert to an integer value, a NULL
105 * pointer is returned.
108 pwent.pw_name = fields[0];
109 pwent.pw_passwd = fields[1];
110 if (get_uid (fields[2], &pwent.pw_uid) == 0) {
113 if (get_gid (fields[3], &pwent.pw_gid) == 0) {
116 pwent.pw_gecos = fields[4];
117 pwent.pw_dir = fields[5];
118 pwent.pw_shell = fields[6];