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1 /* ----------------------------------------------------------------------- *
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2 *
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3 * Copyright 1996-2016 The NASM Authors - All Rights Reserved
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4 * See the file AUTHORS included with the NASM distribution for
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5 * the specific copyright holders.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following
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9 * conditions are met:
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10 *
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11 * * Redistributions of source code must retain the above copyright
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12 * notice, this list of conditions and the following disclaimer.
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13 * * Redistributions in binary form must reproduce the above
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14 * copyright notice, this list of conditions and the following
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15 * disclaimer in the documentation and/or other materials provided
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16 * with the distribution.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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19 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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31 *
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32 * ----------------------------------------------------------------------- */
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33
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34 /*
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35 * rdstrnum.c
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36 *
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37 * This converts a NASM string to an integer, used when a string
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38 * is used in an integer constant context. This is a binary conversion,
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39 * not a conversion from a numeric constant in text form.
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40 */
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41
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42 #include "compiler.h"
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43 #include "nasmlib.h"
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44 #include "nasm.h"
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45
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46 int64_t readstrnum(char *str, int length, bool *warn)
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47 {
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48 int64_t charconst = 0;
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49 int i;
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50
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51 *warn = false;
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52
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53 str += length;
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54 if (globalbits == 64) {
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55 for (i = 0; i < length; i++) {
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56 if (charconst & UINT64_C(0xFF00000000000000))
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57 *warn = true;
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58 charconst = (charconst << 8) + (uint8_t)*--str;
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59 }
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60 } else {
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61 for (i = 0; i < length; i++) {
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62 if (charconst & 0xFF000000UL)
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63 *warn = true;
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64 charconst = (charconst << 8) + (uint8_t)*--str;
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65 }
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66 }
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67 return charconst;
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68 }
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