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Code Issues Releases Activity

Replace fscanf with faster parsing (#127)

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Peak 2023-10-07 13:45:54 -04:00 committed by GitHub
parent b5f160ffb4
commit 2fe0c36845
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 12 deletions
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27
core/sourcehook/sh_memory.h
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@ -59,6 +59,7 @@ namespace SourceHook
// On linux, first check /proc/self/maps
unsigned long laddr = reinterpret_cast<unsigned long>(addr);
bool bFound = false;
FILE *pF = fopen("/proc/self/maps", "r");
if (pF) {
// Linux /proc/self/maps -> parse
@ -67,10 +68,18 @@ namespace SourceHook
// 08048000-0804c000 r-xp 00000000 03:03 1010107 /bin/cat
unsigned long rlower, rupper;
char r, w, x;
while (fscanf(pF, "%lx-%lx %c%c%c", &rlower, &rupper, &r, &w, &x) != EOF) {
char *buffer = NULL;
size_t bufsize = 0;
while (getline(&buffer, &bufsize, pF) != -1) {
char *addr_split;
char *prot_split;
rlower = strtoul(buffer, &addr_split, 16);
rupper = strtoul(&addr_split[1], &prot_split, 16);
// Check whether we're IN THERE!
if (laddr >= rlower && laddr < rupper) {
fclose(pF);
r = prot_split[1];
w = prot_split[2];
x = prot_split[3];
*bits = 0;
if (r == 'r')
*bits |= SH_MEM_READ;
@ -78,19 +87,13 @@ namespace SourceHook
*bits |= SH_MEM_WRITE;
if (x == 'x')
*bits |= SH_MEM_EXEC;
return true;
}
// Read to end of line
int c;
while ((c = fgetc(pF)) != '\n') {
if (c == EOF)
break;
}
if (c == EOF)
bFound = true;
break;
}
}
free(buffer);
fclose(pF);
return false;
return bFound;
}
pF = fopen("/proc/curproc/map", "r");
if (pF) {