52 lines
770 B
C
52 lines
770 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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extern int getline(char **line, size_t *len, FILE *file);
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int getline(char **line, size_t *len, FILE *file)
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{
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char *ptr, *end;
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int c;
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if (*line == NULL) {
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errno = EINVAL;
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if (*len == 0)
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*line = malloc(4096);
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if (*line == NULL)
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return -1;
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*len = 4096;
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}
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ptr = *line;
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end = *line + *len;
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while ((c = fgetc(file)) != EOF) {
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if (ptr + 1 >= end) {
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char *newline;
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int offset;
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newline = realloc(*line, *len + 4096);
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if (newline == NULL)
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return -1;
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offset = ptr - *line;
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*line = newline;
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*len += 4096;
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ptr = *line + offset;
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end = *line + *len;
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}
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*ptr++ = c;
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if (c == '\n') {
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*ptr = '\0';
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return ptr - *line;
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}
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}
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*ptr = '\0';
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return -1;
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}
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