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#include "fmt.h"
#include "textcode.h"
#include "str.h"
#include "haveinline.h"
size_t fmt_foldwhitespace(char* dest,const char* src,size_t len) {
register const unsigned char* s=(const unsigned char*) src;
size_t i;
char c;
for (i=0; i<len; ++i) {
switch (c=s[i]) {
case ' ': case '\t': case '\n': c='_'; break;
if (dest) dest[i]=c;
return len;