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Avoid unnecessary copies in symbol init

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This commit is contained in:
ISSOtm
2020-01-30 02:15:43 +01:00
parent e2e01e84fa
commit 6d4b128611
2 changed files with 19 additions and 29 deletions
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46
src/asm/symbol.c
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@@ -49,22 +49,6 @@ static char SavedMINUTE[3];
static char SavedSECOND[3];
static bool exportall;
void helper_RemoveLeadingZeros(char *string)
{
char *new_beginning = string;
while (*new_beginning == '0')
new_beginning++;
if (new_beginning == string)
return;
if (*new_beginning == '\0')
new_beginning--;
memmove(string, new_beginning, strlen(new_beginning) + 1);
}
int32_t Callback_NARG(unused_ struct sSymbol *sym)
{
uint32_t i = 0;
@@ -473,7 +457,7 @@ void sym_AddEqu(char *tzSym, int32_t value)
* of the string are enough: sym_AddString("M_PI", "3.1415"). This is the same
* as ``` M_PI EQUS "3.1415" ```
*/
void sym_AddString(char *tzSym, char *tzValue)
void sym_AddString(char *tzSym, char const *tzValue)
{
struct sSymbol *nsym = createNonrelocSymbol(tzSym);
@@ -710,6 +694,17 @@ void sym_SetExportAll(uint8_t set)
exportall = set;
}
/**
* Returns a pointer to the first non-zero character in a string
* Non-'0', not non-'\0'.
*/
static inline char const *removeLeadingZeros(char const *ptr)
{
while (*ptr == '0')
ptr++;
return ptr;
}
/*
* Initialize the symboltable
*/
@@ -760,28 +755,23 @@ void sym_Init(void)
time_utc);
strftime(SavedYEAR, sizeof(SavedYEAR), "%Y", time_utc);
/* This cannot start with zeros */
strftime(SavedMONTH, sizeof(SavedMONTH), "%m", time_utc);
helper_RemoveLeadingZeros(SavedMONTH);
strftime(SavedDAY, sizeof(SavedDAY), "%d", time_utc);
helper_RemoveLeadingZeros(SavedDAY);
strftime(SavedHOUR, sizeof(SavedHOUR), "%H", time_utc);
helper_RemoveLeadingZeros(SavedHOUR);
strftime(SavedMINUTE, sizeof(SavedMINUTE), "%M", time_utc);
helper_RemoveLeadingZeros(SavedMINUTE);
strftime(SavedSECOND, sizeof(SavedSECOND), "%S", time_utc);
helper_RemoveLeadingZeros(SavedSECOND);
sym_AddString("__TIME__", SavedTIME);
sym_AddString("__DATE__", SavedDATE);
sym_AddString("__ISO_8601_LOCAL__", SavedTIMESTAMP_ISO8601_LOCAL);
sym_AddString("__ISO_8601_UTC__", SavedTIMESTAMP_ISO8601_UTC);
sym_AddString("__UTC_DAY__", SavedDAY);
sym_AddString("__UTC_MONTH__", SavedMONTH);
/* This cannot start with zeros */
sym_AddString("__UTC_YEAR__", SavedYEAR);
sym_AddString("__UTC_HOUR__", SavedHOUR);
sym_AddString("__UTC_MINUTE__", SavedMINUTE);
sym_AddString("__UTC_SECOND__", SavedSECOND);
sym_AddString("__UTC_MONTH__", removeLeadingZeros(SavedMONTH));
sym_AddString("__UTC_DAY__", removeLeadingZeros(SavedDAY));
sym_AddString("__UTC_HOUR__", removeLeadingZeros(SavedHOUR));
sym_AddString("__UTC_MINUTE__", removeLeadingZeros(SavedMINUTE));
sym_AddString("__UTC_SECOND__", removeLeadingZeros(SavedSECOND));
pScope = NULL;