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22 lines
515 B
C
22 lines
515 B
C
// returns symbols from 32 to 126 read from /dev/urandom, not thread-safe
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// s - length of data with trailing zero
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#include <sys/random.h>
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char *randstring(size_t *s){
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static char buf[256];
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char rbuf[255];
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ssize_t L = getrandom(rbuf, 255, 0);
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if(L < 1){
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*s = 0;
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return NULL;
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}
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size_t total = 0;
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for(size_t x = 0; x < (size_t)L; ++x){
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char s = rbuf[x];
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if(s > 31 && s < 127) buf[total++] = s;
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}
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buf[total++] = 0;
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*s = total;
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return buf;
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}
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