Chee Yee
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
// getline() is written to POSIX spec so that it can be used on Windows platforms
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// This is taken from a stackexchange answer, link has since been lost.
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <errno.h>
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typedef intptr_t ssize_t;
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ssize_t getline(char** lineptr, size_t* n, FILE* stream) {
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size_t pos;
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int c;
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if (lineptr == NULL || stream == NULL || n == NULL) {
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errno = EINVAL;
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return -1;
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}
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c = getc(stream);
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if (c == EOF) {
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return -1;
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}
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if (*lineptr == NULL) {
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*lineptr = (char*)malloc(128);
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if (*lineptr == NULL) {
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return -1;
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}
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*n = 128;
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}
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pos = 0;
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while (c != EOF) {
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if (pos + 1 >= *n) {
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size_t new_size = *n + (*n >> 2);
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if (new_size < 128) {
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new_size = 128;
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}
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char* new_ptr = (char*)realloc(*lineptr, new_size);
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if (new_ptr == NULL) {
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return -1;
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}
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*n = new_size;
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*lineptr = new_ptr;
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}
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((unsigned char*)(*lineptr))[pos++] = c;
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if (c == '\n') {
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break;
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}
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c = getc(stream);
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}
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(*lineptr)[pos] = '\0';
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return pos;
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} |