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73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
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/* This is a replacement function for mkdtemp in case the platform
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we're building on (like mine!) doesn't have it. */
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#include <config.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "types.h"
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#include "cipher.h"
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char *mkdtemp(char *template)
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{
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int attempts,index,count=0;
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byte *ch;
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index=strlen(template);
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ch=&template[index-1];
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/* Walk backwards to count all the Xes */
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while(*ch=='X' && count<index)
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{
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count++;
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ch--;
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}
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ch++;
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if(count==0)
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{
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errno=EINVAL;
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return NULL;
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}
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/* Try 4 times to make the temp directory */
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for(attempts=0;attempts<4;attempts++)
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{
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int index=0,remaining=count;
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char *marker=ch;
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byte *randombits;
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/* Using really random bits is probably overkill here. The
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worst thing that can happen with a directory name collision
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is that the function will return an error. */
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randombits=get_random_bits(4*remaining,0,0);
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while(remaining>1)
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{
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sprintf(marker,"%02X",randombits[index++]);
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marker+=2;
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remaining-=2;
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}
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/* Any leftover Xes? get_random_bits rounds up to full bytes,
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so this is safe. */
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if(remaining>0)
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sprintf(marker,"%X",randombits[index]&0xF);
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m_free(randombits);
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if(mkdir(template,0700)==0)
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break;
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}
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if(attempts==4)
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return NULL; /* keeps the errno from mkdir, whatever it is */
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return template;
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}
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