*: optimize code size in strtoul calls

function                                             old     new   delta
bb_parse_mode                                        433     431      -2
rtnl_rtntype_a2n                                     202     198      -4
ParseField                                           511     498     -13
bb_init_module_24                                   4730    4675     -55
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-74)             Total: -74 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

8 files changed, 37 insertions, 23 deletions

diff --git a/libbb/parse_mode.c b/libbb/parse_mode.c
index 40105dd3a..6eca00ab1 100644
--- a/libbb/parse_mode.c
+++ b/libbb/parse_mode.c
@@ -40,7 +40,7 @@ int FAST_FUNC bb_parse_mode(const char *s, mode_t *current_mode)
 	mode_t new_mode;
 	char op;
 
-	if (((unsigned int)(*s - '0')) < 8) {
+	if ((unsigned char)(*s - '0') < 8) {
 		unsigned long tmp;
 		char *e;
 
diff --git a/libpwdgrp/pwd_grp.c b/libpwdgrp/pwd_grp.c
index e2077ade0..947f48d43 100644
--- a/libpwdgrp/pwd_grp.c
+++ b/libpwdgrp/pwd_grp.c
@@ -816,7 +816,7 @@ static int bb__parsepwent(void *data, char *line)
 
 	i = 0;
 	do {
-		p = ((char *) ((struct passwd *) data)) + pw_off[i];
+		p = (char *) data + pw_off[i];
 
 		if ((i & 6) ^ 2) {	/* i!=2 and i!=3 */
 			*((char **) p) = line;
@@ -873,7 +873,7 @@ static int bb__parsegrent(void *data, char *line)
 	end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */
 	i = 0;
 	do {
-		p = ((char *) ((struct group *) data)) + gr_off[i];
+		p = (char *) data + gr_off[i];
 
 		if (i < 2) {
 			*((char **) p) = line;
@@ -966,15 +966,15 @@ static const unsigned char sp_off[] ALIGN1 = {
 	offsetof(struct spwd, sp_flag)          /* 8 - not a char ptr */
 };
 
-static int bb__parsespent(void *data, char * line)
+static int bb__parsespent(void *data, char *line)
 {
 	char *endptr;
 	char *p;
 	int i;
 
 	i = 0;
-	do {
-		p = ((char *) ((struct spwd *) data)) + sp_off[i];
+	while (1) {
+		p = (char *) data + sp_off[i];
 		if (i < 2) {
 			*((char **) p) = line;
 			line = strchr(line, ':');
@@ -982,10 +982,10 @@ static int bb__parsespent(void *data, char * line)
 				break;
 			}
 		} else {
-			*((long *) p) = (long) strtoul(line, &endptr, 10);
+			*((long *) p) = strtoul(line, &endptr, 10);
 
 			if (endptr == line) {
-				*((long *) p) = ((i != 8) ? -1L : ((long)(~0UL)));
+				*((long *) p) = (i != 8) ? -1L : (long)(~0UL);
 			}
 
 			line = endptr;
@@ -1003,9 +1003,9 @@ static int bb__parsespent(void *data, char * line)
 
 		}
 
-		*line++ = 0;
+		*line++ = '\0';
 		++i;
-	} while (1);
+	}
 
 	return EINVAL;
 }
diff --git a/miscutils/crond.c b/miscutils/crond.c
index f0b64fe3a..d2104c36f 100644
--- a/miscutils/crond.c
+++ b/miscutils/crond.c
@@ -320,11 +320,13 @@ static void ParseField(char *user, char *ary, int modvalue, int off,
 			skip = 1;
 			++ptr;
 		} else if (isdigit(*ptr)) {
+			char *endp;
 			if (n1 < 0) {
-				n1 = strtol(ptr, &ptr, 10) + off;
+				n1 = strtol(ptr, &endp, 10) + off;
 			} else {
-				n2 = strtol(ptr, &ptr, 10) + off;
+				n2 = strtol(ptr, &endp, 10) + off;
 			}
+			ptr = endp; /* gcc likes temp var for &endp */
 			skip = 1;
 		} else if (names) {
 			int i;
@@ -361,7 +363,9 @@ static void ParseField(char *user, char *ary, int modvalue, int off,
 			n2 = n1;
 		}
 		if (*ptr == '/') {
-			skip = strtol(ptr + 1, &ptr, 10);
+			char *endp;
+			skip = strtol(ptr + 1, &endp, 10);
+			ptr = endp; /* gcc likes temp var for &endp */
 		}
 
 		/*
diff --git a/modutils/modutils-24.c b/modutils/modutils-24.c
index 9f91c9979..e5ff54d29 100644
--- a/modutils/modutils-24.c
+++ b/modutils/modutils-24.c
@@ -2432,11 +2432,11 @@ new_process_module_arguments(struct obj_file *f, const char *options)
 		loc = contents + sym->value;
 
 		if (*pinfo == 'c') {
-			if (!isdigit(*(pinfo + 1))) {
+			if (!isdigit(pinfo[1])) {
 				bb_error_msg_and_die("parameter type 'c' for %s must be followed by"
 						     " the maximum size", param);
 			}
-			charssize = strtoul(pinfo + 1, (char **) NULL, 10);
+			charssize = strtoul(pinfo + 1, NULL, 10);
 		}
 
 		if (val == NULL) {
@@ -2449,6 +2449,8 @@ new_process_module_arguments(struct obj_file *f, const char *options)
 		n = 0;
 		p = val;
 		while (*p != 0) {
+			char *endp;
+
 			if (++n > max)
 				bb_error_msg_and_die("too many values for %s (max %d)", param, max);
 
@@ -2472,19 +2474,23 @@ new_process_module_arguments(struct obj_file *f, const char *options)
 				p += len;
 				break;
 			case 'b':
-				*loc++ = strtoul(p, &p, 0);
+				*loc++ = strtoul(p, &endp, 0);
+				p = endp; /* gcc likes temp var for &endp */
 				break;
 			case 'h':
-				*(short *) loc = strtoul(p, &p, 0);
+				*(short *) loc = strtoul(p, &endp, 0);
 				loc += tgt_sizeof_short;
+				p = endp;
 				break;
 			case 'i':
-				*(int *) loc = strtoul(p, &p, 0);
+				*(int *) loc = strtoul(p, &endp, 0);
 				loc += tgt_sizeof_int;
+				p = endp;
 				break;
 			case 'l':
-				*(long *) loc = strtoul(p, &p, 0);
+				*(long *) loc = strtoul(p, &endp, 0);
 				loc += tgt_sizeof_long;
+				p = endp;
 				break;
 			default:
 				bb_error_msg_and_die("unknown parameter type '%c' for %s",
diff --git a/networking/libiproute/rtm_map.c b/networking/libiproute/rtm_map.c
index ca2f4436a..6fe5c4b75 100644
--- a/networking/libiproute/rtm_map.c
+++ b/networking/libiproute/rtm_map.c
@@ -88,7 +88,7 @@ int rtnl_rtntype_a2n(int *id, char *arg)
 		res = RTN_THROW;
 	else {
 		res = strtoul(arg, &end, 0);
-		if (!end || end == arg || *end || res > 255)
+		if (end == arg || *end || res > 255)
 			return -1;
 	}
 	*id = res;
diff --git a/networking/libiproute/utils.c b/networking/libiproute/utils.c
index c84d018eb..5f0971751 100644
--- a/networking/libiproute/utils.c
+++ b/networking/libiproute/utils.c
@@ -22,6 +22,7 @@ unsigned get_unsigned(char *arg, const char *errmsg)
 
 	if (*arg) {
 		res = strtoul(arg, &ptr, 0);
+//FIXME: "" will be accepted too, is it correct?!
 		if (!*ptr && res <= UINT_MAX) {
 			return res;
 		}
@@ -36,6 +37,7 @@ uint32_t get_u32(char *arg, const char *errmsg)
 
 	if (*arg) {
 		res = strtoul(arg, &ptr, 0);
+//FIXME: "" will be accepted too, is it correct?!
 		if (!*ptr && res <= 0xFFFFFFFFUL) {
 			return res;
 		}
@@ -50,6 +52,7 @@ uint16_t get_u16(char *arg, const char *errmsg)
 
 	if (*arg) {
 		res = strtoul(arg, &ptr, 0);
+//FIXME: "" will be accepted too, is it correct?!
 		if (!*ptr && res <= 0xFFFF) {
 			return res;
 		}
diff --git a/networking/tc.c b/networking/tc.c
index fc47e9571..d9636949c 100644
--- a/networking/tc.c
+++ b/networking/tc.c
@@ -89,7 +89,7 @@ static int get_qdisc_handle(__u32 *h, const char *str) {
 	if (p == str)
 		return 1;
 	maj <<= 16;
-	if (*p != ':' && *p!=0)
+	if (*p != ':' && *p != '\0')
 		return 1;
  ok:
 	*h = maj;
@@ -119,7 +119,8 @@ static int get_tc_classid(__u32 *h, const char *str) {
 		maj <<= 16;
 		str = p + 1;
 		min = strtoul(str, &p, 16);
-		if (*p != 0 || min >= (1<<16))
+//FIXME: check for "" too?
+		if (*p != '\0' || min >= (1<<16))
 			return 1;
 		maj |= min;
 	} else if (*p != 0)
diff --git a/shell/ash.c b/shell/ash.c
index 68aa675e5..db28af7d3 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -10078,7 +10078,7 @@ change_random(const char *value)
 		vrandom.flags &= ~VNOFUNC;
 	} else {
 		/* set/reset */
-		random_galois_LFSR = random_LCG = strtoul(value, (char **)NULL, 10);
+		random_galois_LFSR = random_LCG = strtoul(value, NULL, 10);
 	}
 }
 #endif