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annotate actions.c @ 42:233ac9bea4f1

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switched exit code 127 to 126 (because shell returns 127 if command not found)
author meillo@marmaro.de
date Sat, 01 Mar 2008 20:41:35 +0100
parents 1ad3d7305e5d
children 0b82169d4129
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include "baum.h"
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5 #include "actions.h"
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6
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7 unsigned char action_print(struct Node* node);
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8 unsigned char action_sum(struct Node* node);
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9 unsigned char action_number(struct Node* node);
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10 unsigned char action_input(struct Node* node);
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11 unsigned char action_times(struct Node* node);
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15 unsigned char action(struct Node* node) {
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16 if (node == NULL) {
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17 if (option_verbose) {
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18 fprintf(stderr, "warning: action of non existing node\n");
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19 }
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20 return 0;
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21 }
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23 if (strcmp(node->name, "print") == 0) {
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24 return action_print(node);
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26 } else if (strcmp(node->name, "sum") == 0) {
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27 return action_sum(node);
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29 } else if (strcmp(node->name, "number") == 0) {
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30 return action_number(node);
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32 } else if (strcmp(node->name, "input") == 0) {
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33 return action_input(node);
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35 } else if (strcmp(node->name, "times") == 0) {
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36 return action_times(node);
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38 } else {
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39 fprintf(stderr, "unknown kind of node\n");
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40 exit(4);
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41 }
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42 }
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46 unsigned char action_print(struct Node* node) {
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47 unsigned char result;
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48 result = action(node->down);
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49 if (node->value == 'c') {
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50 printf("%c", result);
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51 } else {
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52 printf("%d", result);
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53 }
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54 return result;
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55 }
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58 unsigned char action_sum(struct Node* node) {
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59 struct Node* tp;
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60 tp = node->down;
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61 while (tp != NULL) {
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62 node->value += action(tp);
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63 tp = tp->right;
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64 }
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65 return node->value;
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66 }
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69 unsigned char action_number(struct Node* node) {
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70 if (node->down != NULL) {
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71 action(node->down);
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72 }
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73 return node->value;
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74 }
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77 unsigned char action_input(struct Node* node) {
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78 /* reads a number which is treated as ASCII value */
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79 int input;
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80 printf("input: ");
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81 scanf("%d", &input);
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82 input = input % 256;
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83 insertLast(node, newNode("number", (char) input));
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85 return 0;
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86 }
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89 unsigned char action_times(struct Node* node) {
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90 struct Node* tp;
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91 struct Node* last;
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92 unsigned char i;
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93 tp = node->down;
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94 for (i = 0; i < node->value; i++) {
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95 /* FIXME deep copy */
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96 last = insertLast(node, newNode(tp->name, tp->value));
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97 if (tp->down != NULL) {
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98 last->down = newNode(tp->down->name, tp->down->value);
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99 }
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101 }
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102 return 0;
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103 }