mirror of https://github.com/swaywm/sway.git
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
#define _POSIX_C_SOURCE 200809L
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#include "readline.h"
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#include "log.h"
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#include <stdlib.h>
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#include <stdio.h>
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char *read_line(FILE *file) {
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size_t length = 0, size = 128;
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char *string = malloc(size);
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char lastChar = '\0';
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if (!string) {
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wlr_log(WLR_ERROR, "Unable to allocate memory for read_line");
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return NULL;
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}
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while (1) {
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int c = getc(file);
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if (c == '\n' && lastChar == '\\'){
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--length; // Ignore last character.
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lastChar = '\0';
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continue;
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}
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if (c == EOF || c == '\n' || c == '\0') {
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break;
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}
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if (c == '\r') {
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continue;
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}
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lastChar = c;
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if (length == size) {
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char *new_string = realloc(string, size *= 2);
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if (!new_string) {
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free(string);
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wlr_log(WLR_ERROR, "Unable to allocate memory for read_line");
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return NULL;
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}
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string = new_string;
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}
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string[length++] = c;
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}
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if (length + 1 == size) {
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char *new_string = realloc(string, length + 1);
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if (!new_string) {
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free(string);
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return NULL;
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}
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string = new_string;
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}
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string[length] = '\0';
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return string;
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}
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char *peek_line(FILE *file, int line_offset, long *position) {
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long pos = ftell(file);
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size_t length = 0;
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char *line = NULL;
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for (int i = 0; i <= line_offset; i++) {
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ssize_t read = getline(&line, &length, file);
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if (read < 0) {
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free(line);
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line = NULL;
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break;
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}
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if (read > 0 && line[read - 1] == '\n') {
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line[read - 1] = '\0';
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}
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}
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if (position) {
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*position = ftell(file);
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}
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fseek(file, pos, SEEK_SET);
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return line;
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}
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