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20
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1 /*********************************************
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2 * Description - BasedFileLib makes file I/O less like *nix and more like
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3 * TempleOS
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4 * Author - William King
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5 * Date - Sep 25 2023
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6 * *******************************************/
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7
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8 #define MAX_LINES 100000
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9 #define MAXLENGTH 512
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10
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11 char* ReadFile(const char* fileName) {
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12 FILE* file = fopen(fileName, "rb");
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13 if (file == NULL) {
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14 perror("Error opening file");
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15 return NULL;
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16 }
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17
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18 fseek(file, 0, SEEK_END);
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19 long fileSize = ftell(file);
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20 rewind(file);
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21
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22 char* fileContent = (char*)malloc(fileSize * sizeof(char));
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23 if (fileContent == NULL) {
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24 perror("Error allocating memory for file content");
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25 fclose(file);
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26 return NULL;
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27 }
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28
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29 size_t readSize = fread(fileContent, sizeof(char), fileSize, file);
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30 if (readSize != fileSize) {
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31 perror("Error reading file");
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32 fclose(file);
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33 free(fileContent);
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34 return NULL;
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35 }
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36
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37 fclose(file);
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38 return fileContent;
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39 }
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40
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41 void WriteFile(const char* fileName, const char* content) {
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42 FILE* file = fopen(fileName, "wb");
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43 if (file == NULL) {
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44 perror("Error opening file");
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45 }
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46
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47 size_t writeSize = fwrite(content, sizeof(char), strlen(content), file);
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48 if (writeSize != strlen(content)) {
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49 perror("Error writing to file");
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50 fclose(file);
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51 }
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52
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53 fclose(file);
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54 }
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55
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56
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57 char* DeleteLine(char* str, unsigned int line_number) {
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58 char* lines[MAX_LINES];
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59 char* line;
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60 unsigned int current_line = 0;
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61
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62 line = strtok(str, "\n");
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63 while (line != NULL && current_line < MAX_LINES) {
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64 lines[current_line++] = line;
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65 line = strtok(NULL, "\n");
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66 }
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67
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68 // Delete the specified line
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69 if (line_number > 0 && line_number <= current_line) {
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70 for (unsigned int i = line_number - 1; i < current_line - 1; i++) {
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71 lines[i] = lines[i + 1];
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72 }
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73 current_line--;
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74 }
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75
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76 // Reconstruct the string with remaining lines
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77 str[0] = '\0';
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78 for (unsigned int i = 0; i < current_line; i++) {
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79 strcat(str, lines[i]);
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80 strcat(str, "\n");
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81 }
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82
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83 return str;
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84 }
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85
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86
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87
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88 char* ReadLine(const char *str, unsigned int lineNum) {
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89 int currentLine = 1;
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90 size_t strLen = strlen(str);
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91 char *line = NULL;
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92
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93 line = malloc(strLen + 1);
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94 if (line == NULL) {
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95 fprintf(stderr, "Error: memory allocation failed.\n");
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96 exit(1);
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97 }
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98
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99 int lineStartIndex = 0;
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100 int lineEndIndex = 0;
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101
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102 // Traverse through the string until the desired line or the end of the string
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103 while (currentLine <= lineNum && lineEndIndex < strLen) {
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104 // Find the start index of the current line
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105 while (lineStartIndex < strLen && (str[lineStartIndex] == '\n' || str[lineStartIndex] == '\r')) {
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106 lineStartIndex++;
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107 lineEndIndex++;
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108 }
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109
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110 // Find the end index of the current line
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111 lineEndIndex = lineStartIndex;
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112 while (lineEndIndex < strLen && str[lineEndIndex] != '\n' && str[lineEndIndex] != '\r') {
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113 lineEndIndex++;
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114 }
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115
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116 // Check if the desired line is found
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117 if (currentLine == lineNum) {
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118 // Copy the line to the allocated memory
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119 strncpy(line, str + lineStartIndex, lineEndIndex - lineStartIndex);
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120 line[lineEndIndex - lineStartIndex] = '\0';
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121 break;
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122 }
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123
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124 // Move to the start of the next line
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125 currentLine++;
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126 lineStartIndex = lineEndIndex;
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127 }
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128
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129 return line;
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130 }
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131
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132 //BasedFileLib
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