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authorRob Landley2005-09-08 03:22:09 +0000
committerRob Landley2005-09-08 03:22:09 +0000
commit230b411de87219f8a59e5d4061d7908cd44ed4d7 (patch)
tree53edbc78f93d74f86d9c76ed0536161aac7d4392 /networking/udhcp/options.c
parent658d2cf98616e377fdcf8cde380fec10d966a689 (diff)
downloadbusybox-230b411de87219f8a59e5d4061d7908cd44ed4d7.zip
busybox-230b411de87219f8a59e5d4061d7908cd44ed4d7.tar.gz
Fix the warning by rewriting the function to be smaller and simpler.
I'd appreciate somebody on a __BIG_ENDIAN platform testing this out; I haven't got the hardware...
Diffstat (limited to 'networking/udhcp/options.c')
-rw-r--r--networking/udhcp/options.c45
1 files changed, 17 insertions, 28 deletions
diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c
index ae98194..000f86c 100644
--- a/networking/udhcp/options.c
+++ b/networking/udhcp/options.c
@@ -149,37 +149,26 @@ int add_option_string(uint8_t *optionptr, uint8_t *string)
/* add a one to four byte option to a packet */
int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
{
- char length = 0;
- int i;
- uint8_t option[2 + 4];
- uint8_t *u8;
- uint16_t *u16;
- uint32_t *u32;
- uint32_t aligned;
- u8 = (uint8_t *) &aligned;
- u16 = (uint16_t *) &aligned;
- u32 = &aligned;
-
- for (i = 0; dhcp_options[i].code; i++)
- if (dhcp_options[i].code == code) {
- length = option_lengths[dhcp_options[i].flags & TYPE_MASK];
+ struct dhcp_option *dh;
+
+ for (dh=dhcp_options; dh->code; dh++) {
+ if (dh->code == code) {
+ uint8_t option[6], len;
+
+ option[OPT_CODE] = code;
+ len = option_lengths[dh->flags & TYPE_MASK];
+ option[OPT_LEN] = len;
+ if (__BYTE_ORDER == __BIG_ENDIAN)
+ data <<= 8 * (4 - len);
+ /* This memcpy is for broken processors which can't
+ * handle a simple unaligned 32-bit assignment */
+ memcpy(&option[OPT_DATA], &data, 4);
+ return add_option_string(optionptr, option);
}
-
- if (!length) {
- DEBUG(LOG_ERR, "Could not add option 0x%02x", code);
- return 0;
}
- option[OPT_CODE] = code;
- option[OPT_LEN] = length;
-
- switch (length) {
- case 1: *u8 = data; break;
- case 2: *u16 = data; break;
- case 4: *u32 = data; break;
- }
- memcpy(option + 2, &aligned, length);
- return add_option_string(optionptr, option);
+ DEBUG(LOG_ERR, "Could not add option 0x%02x", code);
+ return 0;
}