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Add NEED_ALLOCA macro

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since a9438d1f5e, project introduced alloca calls.
but in [BSD manpage][1], this function is machine and compiler dependent.
also if use newlib or glibc, this function requires `alloca.h` unlike bsd
system.

this patch just revert alloca call except MSC case.

[1]: https://www.freebsd.org/cgi/man.cgi?alloca
This commit is contained in:
Sunguk Lee
2018-07-22 02:52:55 +09:00
parent 6e7965f013
commit 41248aad1e
1 changed files with 8 additions and 0 deletions
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reedsolomon/rs.c
+8
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@@ -42,6 +42,7 @@
#include "rs.h" #include "rs.h"
#ifdef _MSC_VER #ifdef _MSC_VER
#define NEED_ALLOCA
#define alloca(x) _alloca(x) #define alloca(x) _alloca(x)
#endif #endif
@@ -225,10 +226,17 @@ static int invert_mat(gf *src, int k) {
int irow, icol, row, col, i, ix; int irow, icol, row, col, i, ix;
int error = 1; int error = 1;
#ifdef NEED_ALLOCA
int *indxc = alloca(k*sizeof(int)); int *indxc = alloca(k*sizeof(int));
int *indxr = alloca(k*sizeof(int)); int *indxr = alloca(k*sizeof(int));
int *ipiv = alloca(k*sizeof(int)); int *ipiv = alloca(k*sizeof(int));
gf *id_row = alloca(k*sizeof(gf)); gf *id_row = alloca(k*sizeof(gf));
#else
int indxc[k];
int indxr[k];
int ipiv[k];
gf id_row[k];
#endif
memset(id_row, 0, k*sizeof(gf)); memset(id_row, 0, k*sizeof(gf));
/* /*