43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
# get_next_line
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A function that reads a line from a file descriptor.
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## 💡 About
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The get_next_line project is a programming function that reads a line ending with a newline character from a file descriptor. When calling the function in a loop, it will then allow you to read the text file pointed to by the file descriptor, one line at a time until the end of the file.
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## 🛠️ Function Prototype
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```c
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char *get_next_line(int fd);
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```
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## 📋 Usage
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```c
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#include "get_next_line.h"
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#include <fcntl.h>
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int main(void)
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{
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int fd;
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char *line;
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fd = open("test.txt", O_RDONLY);
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while ((line = get_next_line(fd)) != NULL)
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{
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printf("%s", line);
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free(line);
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}
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close(fd);
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return (0);
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}
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```
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## ⚠️ Return Value
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* The line that was read when successful
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* NULL if there is nothing else to read or if an error occurred
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## 📊 Expected Behavior
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* Repeated calls to get_next_line() should let you read the text file pointed to by the file descriptor, one line at a time
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* The function should return the line that was read
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* If there is nothing else to read or if an error occurred, it should return NULL
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* Call gnl with fd -2 for clear buffer
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* The returned line should include the terminating \n character, except if the end of file was reached and does not end with a \n character
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