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2 | pj | 1 | /* Project: OSLib |
2 | * Description: The OS Construction Kit |
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3 | * Date: 1.6.2000 |
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4 | * Idea by: Luca Abeni & Gerardo Lamastra |
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5 | * |
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6 | * OSLib is an SO project aimed at developing a common, easy-to-use |
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7 | * low-level infrastructure for developing OS kernels and Embedded |
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8 | * Applications; it partially derives from the HARTIK project but it |
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9 | * currently is independently developed. |
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10 | * |
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11 | * OSLib is distributed under GPL License, and some of its code has |
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12 | * been derived from the Linux kernel source; also some important |
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13 | * ideas come from studying the DJGPP go32 extender. |
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14 | * |
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15 | * We acknowledge the Linux Community, Free Software Foundation, |
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16 | * D.J. Delorie and all the other developers who believe in the |
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17 | * freedom of software and ideas. |
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18 | * |
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19 | * For legalese, check out the included GPL license. |
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20 | */ |
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21 | |||
22 | #include <ll/i386/stdlib.h> |
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23 | #include <ll/i386/string.h> |
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24 | #include <ll/i386/limits.h> |
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25 | #include <ll/stdarg.h> |
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26 | #include <ll/ctype.h> |
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27 | #include <ll/math.h> |
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28 | |||
29 | FILE(strtou); |
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30 | |||
31 | long unsigned strtou(char *s,int base,char **scan_end) |
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32 | { |
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33 | int value,overflow = 0; |
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34 | long unsigned result = 0,oldresult; |
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35 | /* Skip trailing zeros */ |
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36 | while (*s == '0') s++; |
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37 | if (*s == 'x' && base == 16) { |
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38 | s++; |
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39 | while (*s == '0') s++; |
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40 | } |
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41 | /* Convert number */ |
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42 | while (isnumber(*s,base)) { |
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43 | value = tonumber(*s++); |
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44 | if (value > base || value < 0) return(0); |
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45 | oldresult = result; |
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46 | result *= base; |
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47 | result += value; |
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48 | /* Detect overflow */ |
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49 | if (oldresult > result) overflow = 1; |
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50 | } |
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51 | if (scan_end != 0L) *scan_end = s; |
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52 | if (overflow) result = INT_MAX; |
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53 | return(result); |
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54 | } |
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55 | |||
56 |