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util/nvmutil: minor code size optimisation 

not just sloccount, but compiled binary size as
tested with tcc on an x86_64 host
fsdg20230625
Leah Rowe 2023-04-07 02:21:37 +01:00
parent 34eeca1f03
commit 7755f0e0c7
1 changed files with 23 additions and 33 deletions
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44
util/nvmutil/nvmutil.c
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@ -40,7 +40,7 @@
void readGbeFile(int *fd, const char *path, int flags, void readGbeFile(int *fd, const char *path, int flags,
size_t nr); size_t nr);
void cmd_setmac(const char *strMac); void cmd_setmac(const char *strMac);
int parseMacAddress(const char *strMac, uint16_t *mac); int invalidMacAddress(const char *strMac, uint16_t *mac);
uint8_t hextonum(char chs); uint8_t hextonum(char chs);
uint8_t rhex(void); uint8_t rhex(void);
void cmd_dump(void); void cmd_dump(void);
@ -160,7 +160,7 @@ readGbeFile(int *fd, const char *path, int flags, size_t nr)
else if (fstat((*fd), &st) == -1) else if (fstat((*fd), &st) == -1)
err(errno, "%s", path); err(errno, "%s", path);
else if ((st.st_size != SIZE_8KB)) else if ((st.st_size != SIZE_8KB))
err(errno = ECANCELED, "File \"%s\" not of size 8KiB", path); err(errno = ECANCELED, "File `%s` not 8KiB", path);
else if (errno == ENOTDIR) else if (errno == ENOTDIR)
errno = 0; errno = 0;
@ -178,45 +178,40 @@ void
cmd_setmac(const char *strMac) cmd_setmac(const char *strMac)
{ {
uint16_t mac[3] = {0, 0, 0}; uint16_t mac[3] = {0, 0, 0};
if (parseMacAddress(strMac, mac) == -1) if (invalidMacAddress(strMac, mac))
err(errno = ECANCELED, "Bad MAC address"); err(errno = ECANCELED, "Bad MAC address");
for (int partnum = 0; partnum < 2; partnum++) { for (int partnum = 0; partnum < 2; partnum++) {
if (!validChecksum(partnum)) if (validChecksum(part = partnum)) {
continue;
for (int w = 0; w < 3; w++) for (int w = 0; w < 3; w++)
setWord(w, partnum, mac[w]); setWord(w, partnum, mac[w]);
byteswap(6, partnum); /* mac words are stored big-endian */
part = partnum;
cmd_setchecksum(); cmd_setchecksum();
} }
} }
}
int int
parseMacAddress(const char *strMac, uint16_t *mac) invalidMacAddress(const char *strMac, uint16_t *mac)
{ {
uint8_t h; uint8_t h;
uint64_t total = 0; uint64_t total = 0;
if (strnlen(strMac, 20) != 17) if (strnlen(strMac, 20) == 17) {
return -1;
for (int i = 0; i < 16; i += 3) { for (int i = 0; i < 16; i += 3) {
if (i != 15) if (i != 15)
if (strMac[i + 2] != ':') if (strMac[i + 2] != ':')
return -1; return 1;
int byte = i / 3; int byte = i / 3;
for (int nib = 0; nib < 2; nib++, total += h) { for (int nib = 0; nib < 2; nib++, total += h) {
if ((h = hextonum(strMac[i + nib])) > 15) if ((h = hextonum(strMac[i + nib])) > 15)
return -1; return 1;
if ((byte == 0) && (nib == 1)) if ((byte == 0) && (nib == 1))
if (strMac[i + nib] == '?') if (strMac[i + nib] == '?')
h = (h & 0xE) | 2; /* local, unicast */ h = (h & 0xE) | 2; /* local, unicast */
mac[byte >> 1] |= ((uint16_t ) h) mac[byte >> 1] |= ((uint16_t ) h)
<< ((8 * ((byte % 2) ^ 1)) + (4 * (nib ^ 1))); << ((8 * (byte % 2)) + (4 * (nib ^ 1)));
} }
} }}
return ((total == 0) || (mac[0] & 0x100)) return ((total == 0) | (mac[0] & 1)); /* multicast/all-zero banned */
? -1 : 0; /* multicast/all-zero not permitted */
} }
uint8_t uint8_t
@ -310,22 +305,18 @@ cmd_brick(void)
void void
cmd_swap(void) cmd_swap(void)
{ {
if (validChecksum(1) || validChecksum(0)) { gbe[0] ^= gbe[1]; /* speedhack: swap ptr, not words */
gbe[0] ^= gbe[1]; /* speedhack: xorswap pointers, not words */
gbe[1] ^= gbe[0]; gbe[1] ^= gbe[0];
gbe[0] ^= gbe[1]; gbe[0] ^= gbe[1];
gbeFileModified = nvmPartModified[0] = nvmPartModified[1] = 1; gbeFileModified = nvmPartModified[0] = nvmPartModified[1]
errno = 0; = validChecksum(1) | validChecksum(0);
}
} }
void void
cmd_copy(void) cmd_copy(void)
{ {
if (validChecksum(part)) {
gbe[part ^ 1] = gbe[part]; /* speedhack: copy ptr, not words */ gbe[part ^ 1] = gbe[part]; /* speedhack: copy ptr, not words */
gbeFileModified = nvmPartModified[part ^ 1] = 1; gbeFileModified = nvmPartModified[part ^ 1] = validChecksum(part);
}
} }
int int
@ -373,11 +364,10 @@ void
writeGbeFile(int *fd, const char *filename) writeGbeFile(int *fd, const char *filename)
{ {
int p, nw = SIZE_4KB; /* copy/swap need all 4KB written */ int p, nw = SIZE_4KB; /* copy/swap need all 4KB written */
errno = 0;
if ((gbe[0] != gbe[1]) && (gbe[0] < gbe[1])) /* not copy/swap */ if ((gbe[0] != gbe[1]) && (gbe[0] < gbe[1])) /* not copy/swap */
nw = 128; /* speedhack: write only the nvm part */ nw = 128; /* speedhack: write only the nvm part */
for (p = 0; p < 2; p++) { for (p = errno = 0; p < 2; p++) {
if (gbe[0] > gbe[1]) if (gbe[0] > gbe[1])
p ^= 1; /* speedhack: write sequentially on-disk */ p ^= 1; /* speedhack: write sequentially on-disk */
if (!nvmPartModified[p]) if (!nvmPartModified[p])