--- /dev/null
+--- a/ssmtp.c
++++ b/ssmtp.c
+@@ -51,21 +51,21 @@ bool_t use_oldauth = False; /* use old
+
+ #define ARPADATE_LENGTH 32 /* Current date in RFC format */
+ char arpadate[ARPADATE_LENGTH];
+-char *auth_user = (char)NULL;
+-char *auth_pass = (char)NULL;
+-char *auth_method = (char)NULL; /* Mechanism for SMTP authentication */
+-char *mail_domain = (char)NULL;
+-char *from = (char)NULL; /* Use this as the From: address */
++char *auth_user = NULL;
++char *auth_pass = NULL;
++char *auth_method = NULL; /* Mechanism for SMTP authentication */
++char *mail_domain = NULL;
++char *from = NULL; /* Use this as the From: address */
+ char *hostname;
+ char *mailhost = "mailhub";
+-char *minus_f = (char)NULL;
+-char *minus_F = (char)NULL;
++char *minus_f = NULL;
++char *minus_F = NULL;
+ char *gecos;
+-char *prog = (char)NULL;
++char *prog = NULL;
+ char *root = NULL;
+ char *tls_cert = "/etc/ssl/certs/ssmtp.pem"; /* Default Certificate */
+-char *uad = (char)NULL;
+-char *config_file = (char)NULL; /* alternate configuration file */
++char *uad = NULL;
++char *config_file = NULL; /* alternate configuration file */
+
+ headers_t headers, *ht;
+
+@@ -257,7 +257,7 @@ char *strip_post_ws(char *str)
+
+ p = (str + strlen(str));
+ while(isspace(*--p)) {
+- *p = (char)NULL;
++ *p = '\0';
+ }
+
+ return(p);
+@@ -275,7 +275,7 @@ char *addr_parse(char *str)
+ #endif
+
+ /* Simple case with email address enclosed in <> */
+- if((p = strdup(str)) == (char *)NULL) {
++ if((p = strdup(str)) == NULL) {
+ die("addr_parse(): strdup()");
+ }
+
+@@ -283,7 +283,7 @@ char *addr_parse(char *str)
+ q++;
+
+ if((p = strchr(q, '>'))) {
+- *p = (char)NULL;
++ *p = '\0';
+ }
+
+ #if 0
+@@ -306,7 +306,7 @@ char *addr_parse(char *str)
+ q = strip_post_ws(p);
+ if(*q == ')') {
+ while((*--q != '('));
+- *q = (char)NULL;
++ *q = '\0';
+ }
+ (void)strip_post_ws(p);
+
+@@ -359,7 +359,7 @@ bool_t standardise(char *str, bool_t *li
+ *linestart = False;
+
+ if((p = strchr(str, '\n'))) {
+- *p = (char)NULL;
++ *p = '\0';
+ *linestart = True;
+ }
+ return(leadingdot);
+@@ -380,7 +380,7 @@ void revaliases(struct passwd *pw)
+ while(fgets(buf, sizeof(buf), fp)) {
+ /* Make comments invisible */
+ if((p = strchr(buf, '#'))) {
+- *p = (char)NULL;
++ *p = '\0';
+ }
+
+ /* Ignore malformed lines and comments */
+@@ -515,11 +515,11 @@ void rcpt_save(char *str)
+ #endif
+
+ /* Ignore missing usernames */
+- if(*str == (char)NULL) {
++ if(*str == '\0') {
+ return;
+ }
+
+- if((rt->string = strdup(str)) == (char *)NULL) {
++ if((rt->string = strdup(str)) == NULL) {
+ die("rcpt_save() -- strdup() failed");
+ }
+
+@@ -544,7 +544,7 @@ void rcpt_parse(char *str)
+ (void)fprintf(stderr, "*** rcpt_parse(): str = [%s]\n", str);
+ #endif
+
+- if((p = strdup(str)) == (char *)NULL) {
++ if((p = strdup(str)) == NULL) {
+ die("rcpt_parse(): strdup() failed");
+ }
+ q = p;
+@@ -572,7 +572,7 @@ void rcpt_parse(char *str)
+ }
+
+ /* End of string? */
+- if(*(q + 1) == (char)NULL) {
++ if(*(q + 1) == '\0') {
+ got_addr = True;
+ }
+
+@@ -580,7 +580,7 @@ void rcpt_parse(char *str)
+ if((*q == ',') && (in_quotes == False)) {
+ got_addr = True;
+
+- *q = (char)NULL;
++ *q = '\0';
+ }
+
+ if(got_addr) {
+@@ -664,7 +664,7 @@ void header_save(char *str)
+ (void)fprintf(stderr, "header_save(): str = [%s]\n", str);
+ #endif
+
+- if((p = strdup(str)) == (char *)NULL) {
++ if((p = strdup(str)) == NULL) {
+ die("header_save() -- strdup() failed");
+ }
+ ht->string = p;
+@@ -672,7 +672,7 @@ void header_save(char *str)
+ if(strncasecmp(ht->string, "From:", 5) == 0) {
+ #if 1
+ /* Hack check for NULL From: line */
+- if(*(p + 6) == (char)NULL) {
++ if(*(p + 6) == '\0') {
+ return;
+ }
+ #endif
+@@ -735,19 +735,19 @@ header_parse() -- Break headers into sep
+ void header_parse(FILE *stream)
+ {
+ size_t size = BUF_SZ, len = 0;
+- char *p = (char *)NULL, *q;
++ char *p = NULL, *q;
+ bool_t in_header = True;
+- char l = (char)NULL;
++ char l = '\0';
+ int c;
+
+ while(in_header && ((c = fgetc(stream)) != EOF)) {
+ /* Must have space for up to two more characters, since we
+ may need to insert a '\r' */
+- if((p == (char *)NULL) || (len >= (size - 1))) {
++ if((p == NULL) || (len >= (size - 1))) {
+ size += BUF_SZ;
+
+ p = (char *)realloc(p, (size * sizeof(char)));
+- if(p == (char *)NULL) {
++ if(p == NULL) {
+ die("header_parse() -- realloc() failed");
+ }
+ q = (p + len);
+@@ -772,9 +772,9 @@ void header_parse(FILE *stream)
+ in_header = False;
+
+ default:
+- *q = (char)NULL;
++ *q = '\0';
+ if((q = strrchr(p, '\n'))) {
+- *q = (char)NULL;
++ *q = '\0';
+ }
+ header_save(p);
+
+@@ -805,9 +805,9 @@ void header_parse(FILE *stream)
+ in_header = False;
+
+ default:
+- *q = (char)NULL;
++ *q = '\0';
+ if((q = strrchr(p, '\n'))) {
+- *q = (char)NULL;
++ *q = '\0';
+ }
+ header_save(p);
+
+@@ -872,11 +872,11 @@ bool_t read_config()
+ char *rightside;
+ /* Make comments invisible */
+ if((p = strchr(buf, '#'))) {
+- *p = (char)NULL;
++ *p = '\0';
+ }
+
+ /* Ignore malformed lines and comments */
+- if(strchr(buf, '=') == (char *)NULL) continue;
++ if(strchr(buf, '=') == NULL) continue;
+
+ /* Parse out keywords */
+ p=firsttok(&begin, "= \t\n");
+@@ -886,7 +886,7 @@ bool_t read_config()
+ }
+ if(p && q) {
+ if(strcasecmp(p, "Root") == 0) {
+- if((root = strdup(q)) == (char *)NULL) {
++ if((root = strdup(q)) == NULL) {
+ die("parse_config() -- strdup() failed");
+ }
+
+@@ -900,7 +900,7 @@ bool_t read_config()
+ port = atoi(r);
+ }
+
+- if((mailhost = strdup(q)) == (char *)NULL) {
++ if((mailhost = strdup(q)) == NULL) {
+ die("parse_config() -- strdup() failed");
+ }
+
+@@ -945,7 +945,7 @@ bool_t read_config()
+ mail_domain = strdup(q);
+ }
+
+- if(mail_domain == (char *)NULL) {
++ if(mail_domain == NULL) {
+ die("parse_config() -- strdup() failed");
+ }
+ rewrite_domain = True;
+@@ -1021,7 +1021,7 @@ bool_t read_config()
+ }
+ }
+ else if(strcasecmp(p, "TLSCert") == 0) {
+- if((tls_cert = strdup(q)) == (char *)NULL) {
++ if((tls_cert = strdup(q)) == NULL) {
+ die("parse_config() -- strdup() failed");
+ }
+
+@@ -1032,7 +1032,7 @@ bool_t read_config()
+ #endif
+ /* Command-line overrides these */
+ else if(strcasecmp(p, "AuthUser") == 0 && !auth_user) {
+- if((auth_user = strdup(q)) == (char *)NULL) {
++ if((auth_user = strdup(q)) == NULL) {
+ die("parse_config() -- strdup() failed");
+ }
+
+@@ -1041,7 +1041,7 @@ bool_t read_config()
+ }
+ }
+ else if(strcasecmp(p, "AuthPass") == 0 && !auth_pass) {
+- if((auth_pass = strdup(q)) == (char *)NULL) {
++ if((auth_pass = strdup(q)) == NULL) {
+ die("parse_config() -- strdup() failed");
+ }
+
+@@ -1050,7 +1050,7 @@ bool_t read_config()
+ }
+ }
+ else if(strcasecmp(p, "AuthMethod") == 0 && !auth_method) {
+- if((auth_method = strdup(q)) == (char *)NULL) {
++ if((auth_method = strdup(q)) == NULL) {
+ die("parse_config() -- strdup() failed");
+ }
+
+@@ -1309,7 +1309,7 @@ char *fd_gets(char *buf, int size, int f
+ buf[i++] = c;
+ }
+ }
+- buf[i] = (char)NULL;
++ buf[i] = '\0';
+
+ return(buf);
+ }
+@@ -1433,14 +1433,14 @@ int ssmtp(char *argv[])
+ }
+
+ if((p = strtok(pw->pw_gecos, ";,"))) {
+- if((gecos = strdup(p)) == (char *)NULL) {
++ if((gecos = strdup(p)) == NULL) {
+ die("ssmtp() -- strdup() failed");
+ }
+ }
+ revaliases(pw);
+
+ /* revaliases() may have defined this */
+- if(uad == (char *)NULL) {
++ if(uad == NULL) {
+ uad = append_domain(pw->pw_name);
+ }
+
+@@ -1488,7 +1488,7 @@ int ssmtp(char *argv[])
+ /* Try to log in if username was supplied */
+ if(auth_user) {
+ #ifdef MD5AUTH
+- if(auth_pass == (char *)NULL) {
++ if(auth_pass == NULL) {
+ auth_pass = strdup("");
+ }
+
+@@ -1736,7 +1736,7 @@ char **parse_options(int argc, char *arg
+ j = 0;
+
+ add = 1;
+- while(argv[i][++j] != (char)NULL) {
++ while(argv[i][++j] != '\0') {
+ switch(argv[i][j]) {
+ #ifdef INET6
+ case '6':
+@@ -1754,14 +1754,14 @@ char **parse_options(int argc, char *arg
+ if((!argv[i][(j + 1)])
+ && argv[(i + 1)]) {
+ auth_user = strdup(argv[i+1]);
+- if(auth_user == (char *)NULL) {
++ if(auth_user == NULL) {
+ die("parse_options() -- strdup() failed");
+ }
+ add++;
+ }
+ else {
+ auth_user = strdup(argv[i]+j+1);
+- if(auth_user == (char *)NULL) {
++ if(auth_user == NULL) {
+ die("parse_options() -- strdup() failed");
+ }
+ }
+@@ -1771,14 +1771,14 @@ char **parse_options(int argc, char *arg
+ if((!argv[i][(j + 1)])
+ && argv[(i + 1)]) {
+ auth_pass = strdup(argv[i+1]);
+- if(auth_pass == (char *)NULL) {
++ if(auth_pass == NULL) {
+ die("parse_options() -- strdup() failed");
+ }
+ add++;
+ }
+ else {
+ auth_pass = strdup(argv[i]+j+1);
+- if(auth_pass == (char *)NULL) {
++ if(auth_pass == NULL) {
+ die("parse_options() -- strdup() failed");
+ }
+ }
+@@ -1869,14 +1869,14 @@ char **parse_options(int argc, char *arg
+ case 'F':
+ if((!argv[i][(j + 1)]) && argv[(i + 1)]) {
+ minus_F = strdup(argv[(i + 1)]);
+- if(minus_F == (char *)NULL) {
++ if(minus_F == NULL) {
+ die("parse_options() -- strdup() failed");
+ }
+ add++;
+ }
+ else {
+ minus_F = strdup(argv[i]+j+1);
+- if(minus_F == (char *)NULL) {
++ if(minus_F == NULL) {
+ die("parse_options() -- strdup() failed");
+ }
+ }
+@@ -1888,14 +1888,14 @@ char **parse_options(int argc, char *arg
+ case 'r':
+ if((!argv[i][(j + 1)]) && argv[(i + 1)]) {
+ minus_f = strdup(argv[(i + 1)]);
+- if(minus_f == (char *)NULL) {
++ if(minus_f == NULL) {
+ die("parse_options() -- strdup() failed");
+ }
+ add++;
+ }
+ else {
+ minus_f = strdup(argv[i]+j+1);
+- if(minus_f == (char *)NULL) {
++ if(minus_f == NULL) {
+ die("parse_options() -- strdup() failed");
+ }
+ }
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