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greg |
2.1 |
#ifndef lint |
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greg |
2.6 |
static const char RCSid[] = "$Id: mktemp.c,v 2.5 2003/06/07 12:50:20 schorsch Exp $"; |
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greg |
2.1 |
#endif |
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/* |
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* Replacement mktemp(3) function for systems without |
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greg |
2.3 |
*/ |
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greg |
2.4 |
#include "copyright.h" |
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greg |
2.1 |
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schorsch |
2.5 |
#ifndef NULL |
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greg |
2.2 |
#define NULL 0 |
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schorsch |
2.5 |
#endif |
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greg |
2.1 |
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char * |
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mktemp(template) /* make a unique filename from template */ |
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char *template; |
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{ |
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register char *tb, *te, *p; |
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int pid; |
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/* find string of 6 (opt) X's */ |
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for (te = template; *te; te++) |
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; |
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while (te > template && te[-1] != 'X') |
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te--; |
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if (te == template) |
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return(template); /* no X's! */ |
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for (tb = te; tb > template && tb[-1] == 'X'; tb--) |
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; |
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if (te-tb > 6) /* only need 6 chars */ |
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tb = te-6; |
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pid = getpid(); /* 5 (opt) chars of pid */ |
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for (p = te-2; p >= tb; p--) { |
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*p = pid%10 + '0'; |
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pid /= 10; |
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} |
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p = te-1; /* final character */ |
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for (*p = 'a'; *p <= 'z'; (*p)++) |
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greg |
2.2 |
if (access(template, 0) == -1) |
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greg |
2.1 |
return(template); /* found unique name */ |
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return(NULL); /* failure! */ |
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} |
