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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4973 | right-hear | 1 | /* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */ |
| 2 | /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */ |
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| 3 | #include |
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| 4 | #include |
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| 5 | #include |
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| 6 | #include |
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| 7 | #include |
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| 8 | |||
| 9 | static int mktemp_count = -1; |
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| 10 | |||
| 11 | char * |
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| 12 | mktemp (char *_template) |
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| 13 | { |
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| 14 | static int count = 0; |
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| 15 | char *cp, *dp; |
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| 16 | int i, len, xcount, loopcnt; |
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| 17 | |||
| 18 | /* Reinitialize counter if we were restarted (emacs). */ |
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| 19 | if (__bss_count != mktemp_count) |
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| 20 | { |
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| 21 | mktemp_count = __bss_count; |
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| 22 | count = 0; |
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| 23 | } |
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| 24 | |||
| 25 | len = strlen (_template); |
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| 26 | cp = _template + len; |
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| 27 | |||
| 28 | xcount = 0; |
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| 29 | while (xcount < 6 && cp > _template && cp[-1] == 'X') |
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| 30 | xcount++, cp--; |
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| 31 | |||
| 32 | if (xcount) { |
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| 33 | dp = cp; |
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| 34 | while (dp > _template && dp[-1] != '/' && dp[-1] != '\\' && dp[-1] != ':') |
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| 35 | dp--; |
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| 36 | |||
| 37 | /* Keep the first characters of the template, but turn the rest into |
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| 38 | Xs. */ |
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| 39 | while (cp > dp + 8 - xcount) { |
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| 40 | *--cp = 'X'; |
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| 41 | xcount = (xcount >= 6) ? 6 : 1 + xcount; |
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| 42 | } |
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| 43 | |||
| 44 | /* If dots occur too early -- squash them. */ |
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| 45 | while (dp < cp) { |
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| 46 | if (*dp == '.') *dp = 'a'; |
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| 47 | dp++; |
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| 48 | } |
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| 49 | |||
| 50 | /* Try to add ".tmp" to the filename. Truncate unused Xs. */ |
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| 51 | if (cp + xcount + 3 < _template + len) |
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| 52 | strcpy (cp + xcount, ".tmp"); |
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| 53 | else |
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| 54 | cp[xcount] = 0; |
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| 55 | |||
| 56 | /* This loop can run up to 2<<(5*6) times, or about 10^9 times. */ |
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| 57 | for (loopcnt = 0; loopcnt < (1 << (5 * xcount)); loopcnt++) { |
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| 58 | int c = count++; |
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| 59 | for (i = 0; i < xcount; i++, c >>= 5) |
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| 60 | cp[i] = "abcdefghijklmnopqrstuvwxyz012345"[c & 0x1f]; |
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| 61 | if (!__file_exists(_template)) |
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| 62 | return _template; |
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| 63 | } |
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| 64 | } |
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| 65 | |||
| 66 | /* Failure: truncate the template and return NULL. */ |
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| 67 | *_template = 0; |
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| 68 | return 0; |
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| 69 | } |