79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
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/* posix_getline.c
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* RT-Thread POSIX
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* getdelim(), getline() - read a delimited record from stream, ersatz implementation
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* https://man7.org/linux/man-pages/man3/getline.3.html
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* Authors:
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* https://github.com/ivanrad/getline
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* https://github.com/mysterywolf/getline/
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*
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* Meco Man 2020-09-03 First Version
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*/
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#include <posix_getline.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <limits.h>
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ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream) {
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char *cur_pos, *new_lineptr;
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size_t new_lineptr_len;
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int c;
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if (lineptr == NULL || n == NULL || stream == NULL) {
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errno = EINVAL;
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return -1;
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}
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if (*lineptr == NULL) {
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*n = 128; /* init len */
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if ((*lineptr = (char *)malloc(*n)) == NULL) {
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errno = ENOMEM;
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return -1;
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}
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}
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cur_pos = *lineptr;
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for (;;) {
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c = getc(stream);
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if (ferror(stream) || (c == EOF && cur_pos == *lineptr))
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return -1;
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if (c == EOF)
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break;
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if ((*lineptr + *n - cur_pos) < 2) {
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if (SSIZE_MAX / 2 < *n) {
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#ifdef EOVERFLOW
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errno = EOVERFLOW;
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#else
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errno = ERANGE; /* no EOVERFLOW defined */
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#endif
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return -1;
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}
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new_lineptr_len = *n * 2;
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if ((new_lineptr = (char *)realloc(*lineptr, new_lineptr_len)) == NULL) {
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errno = ENOMEM;
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return -1;
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}
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cur_pos = new_lineptr + (cur_pos - *lineptr);
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*lineptr = new_lineptr;
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*n = new_lineptr_len;
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}
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*cur_pos++ = (char)c;
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if (c == delim)
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break;
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}
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*cur_pos = '\0';
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return (ssize_t)(cur_pos - *lineptr);
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}
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ssize_t getline(char **lineptr, size_t *n, FILE *stream) {
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return getdelim(lineptr, n, '\n', stream);
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}
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