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Prevent redundant memory reallocation in Str.c

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This commit is contained in:
Tatsuya Kinoshita
2021-03-05 06:55:56 +09:00
parent 23926c5b07
commit 58d8af31d1
1 changed files with 8 additions and 15 deletions
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23
Str.c
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@@ -156,8 +156,7 @@ Strcopy(Str x, Str y)
STR_LENGTH_CHECK(x);
STR_LENGTH_CHECK(y);
if (x->area_size < y->length + 1) {
GC_free(x->ptr);
x->ptr = GC_MALLOC_ATOMIC(y->length + 1);
x->ptr = GC_REALLOC(x->ptr, y->length + 1);
if (x->ptr == NULL)
exit(1);
x->area_size = y->length + 1;
@@ -181,8 +180,7 @@ Strcopy_charp(Str x, const char *y)
if (len < 0 || len >= STR_SIZE_MAX)
len = STR_SIZE_MAX - 1;
if (x->area_size < len + 1) {
GC_free(x->ptr);
x->ptr = GC_MALLOC_ATOMIC(len + 1);
x->ptr = GC_REALLOC(x->ptr, len + 1);
if (x->ptr == NULL)
exit(1);
x->area_size = len + 1;
@@ -206,8 +204,7 @@ Strcopy_charp_n(Str x, const char *y, int n)
if (len < 0 || len >= STR_SIZE_MAX)
len = STR_SIZE_MAX - 1;
if (x->area_size < len + 1) {
GC_free(x->ptr);
x->ptr = GC_MALLOC_ATOMIC(len + 1);
x->ptr = GC_REALLOC(x->ptr, len + 1);
if (x->ptr == NULL)
exit(1);
x->area_size = len + 1;
@@ -223,7 +220,7 @@ Strcat_charp_n(Str x, const char *y, int n)
int newlen;
STR_LENGTH_CHECK(x);
if (y == NULL)
if (y == NULL || n == 0)
return;
if (n < 0)
n = STR_SIZE_MAX - 1;
@@ -231,18 +228,17 @@ Strcat_charp_n(Str x, const char *y, int n)
if (newlen <= 0 || newlen > STR_SIZE_MAX) {
newlen = STR_SIZE_MAX;
n = newlen - x->length - 1;
if (n <= 0)
return;
}
if (x->area_size < newlen) {
char *old = x->ptr;
newlen += newlen / 2;
if (newlen <= 0 || newlen > STR_SIZE_MAX)
newlen = STR_SIZE_MAX;
x->ptr = GC_MALLOC_ATOMIC(newlen);
x->ptr = GC_REALLOC(x->ptr, newlen);
if (x->ptr == NULL)
exit(1);
x->area_size = newlen;
bcopy((void *)old, (void *)x->ptr, x->length);
GC_free(old);
}
bcopy((void *)y, (void *)&x->ptr[x->length], n);
x->length += n;
@@ -278,7 +274,6 @@ Strcat_m_charp(Str x, ...)
void
Strgrow(Str x)
{
char *old = x->ptr;
int newlen;
newlen = x->area_size + x->area_size / 5;
if (newlen == x->area_size)
@@ -289,12 +284,10 @@ Strgrow(Str x)
x->length = newlen - 2;
}
if (x->area_size < newlen) {
x->ptr = GC_MALLOC_ATOMIC(newlen);
x->ptr = GC_REALLOC(x->ptr, newlen);
if (x->ptr == NULL)
exit(1);
x->area_size = newlen;
bcopy((void *)old, (void *)x->ptr, x->length);
GC_free(old);
}
x->ptr[x->length] = '\0';
}