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comparison based/basedfilelib.h @ 20:0555050bada0

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author VilyaemKenyaz
date Wed, 27 Sep 2023 08:51:57 -0400
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19:8fe0b5711413 20:0555050bada0
1 /*********************************************
2 * Description - BasedFileLib makes file I/O less like *nix and more like
3 * TempleOS
4 * Author - William King
5 * Date - Sep 25 2023
6 * *******************************************/
7
8 #define MAX_LINES 100000
9 #define MAXLENGTH 512
10
11 char* ReadFile(const char* fileName) {
12 FILE* file = fopen(fileName, "rb");
13 if (file == NULL) {
14 perror("Error opening file");
15 return NULL;
16 }
17
18 fseek(file, 0, SEEK_END);
19 long fileSize = ftell(file);
20 rewind(file);
21
22 char* fileContent = (char*)malloc(fileSize * sizeof(char));
23 if (fileContent == NULL) {
24 perror("Error allocating memory for file content");
25 fclose(file);
26 return NULL;
27 }
28
29 size_t readSize = fread(fileContent, sizeof(char), fileSize, file);
30 if (readSize != fileSize) {
31 perror("Error reading file");
32 fclose(file);
33 free(fileContent);
34 return NULL;
35 }
36
37 fclose(file);
38 return fileContent;
39 }
40
41 void WriteFile(const char* fileName, const char* content) {
42 FILE* file = fopen(fileName, "wb");
43 if (file == NULL) {
44 perror("Error opening file");
45 }
46
47 size_t writeSize = fwrite(content, sizeof(char), strlen(content), file);
48 if (writeSize != strlen(content)) {
49 perror("Error writing to file");
50 fclose(file);
51 }
52
53 fclose(file);
54 }
55
56
57 char* DeleteLine(char* str, unsigned int line_number) {
58 char* lines[MAX_LINES];
59 char* line;
60 unsigned int current_line = 0;
61
62 line = strtok(str, "\n");
63 while (line != NULL && current_line < MAX_LINES) {
64 lines[current_line++] = line;
65 line = strtok(NULL, "\n");
66 }
67
68 // Delete the specified line
69 if (line_number > 0 && line_number <= current_line) {
70 for (unsigned int i = line_number - 1; i < current_line - 1; i++) {
71 lines[i] = lines[i + 1];
72 }
73 current_line--;
74 }
75
76 // Reconstruct the string with remaining lines
77 str[0] = '\0';
78 for (unsigned int i = 0; i < current_line; i++) {
79 strcat(str, lines[i]);
80 strcat(str, "\n");
81 }
82
83 return str;
84 }
85
86
87
88 char* ReadLine(const char *str, unsigned int lineNum) {
89 int currentLine = 1;
90 size_t strLen = strlen(str);
91 char *line = NULL;
92
93 line = malloc(strLen + 1);
94 if (line == NULL) {
95 fprintf(stderr, "Error: memory allocation failed.\n");
96 exit(1);
97 }
98
99 int lineStartIndex = 0;
100 int lineEndIndex = 0;
101
102 // Traverse through the string until the desired line or the end of the string
103 while (currentLine <= lineNum && lineEndIndex < strLen) {
104 // Find the start index of the current line
105 while (lineStartIndex < strLen && (str[lineStartIndex] == '\n' || str[lineStartIndex] == '\r')) {
106 lineStartIndex++;
107 lineEndIndex++;
108 }
109
110 // Find the end index of the current line
111 lineEndIndex = lineStartIndex;
112 while (lineEndIndex < strLen && str[lineEndIndex] != '\n' && str[lineEndIndex] != '\r') {
113 lineEndIndex++;
114 }
115
116 // Check if the desired line is found
117 if (currentLine == lineNum) {
118 // Copy the line to the allocated memory
119 strncpy(line, str + lineStartIndex, lineEndIndex - lineStartIndex);
120 line[lineEndIndex - lineStartIndex] = '\0';
121 break;
122 }
123
124 // Move to the start of the next line
125 currentLine++;
126 lineStartIndex = lineEndIndex;
127 }
128
129 return line;
130 }
131
132 //BasedFileLib