commit - 748b15facbb42406a4fe72cfa4de2e72f005492e
commit + 27bf601b8a55b578d958382de4ff9a8c2643c0b1
blob - /dev/null
blob + 471091ea1f8295cc89f69483b28f00cefb0a9fce (mode 644)
--- /dev/null
+++ textplain.c
+/*
+ * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * A streaming text/plain "parser."
+ */
+
+#include "telescope.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+static int textplain_parse(struct parser*, const char*, size_t);
+static int textplain_free(struct parser*);
+
+static inline int
+emit_line(struct parser *p, enum line_type type, const char *line, size_t len)
+{
+ struct line *l;
+
+ if ((l = calloc(1, sizeof(*l))) == NULL)
+ return 0;
+
+ l->type = type;
+
+ if (len != 0) {
+ if ((l->line = calloc(1, len+1)) == NULL) {
+ free(l);
+ return 0;
+ }
+
+ memcpy(l->line, line, len);
+ }
+
+ if (TAILQ_EMPTY(&p->head))
+ TAILQ_INSERT_HEAD(&p->head, l, lines);
+ else
+ TAILQ_INSERT_TAIL(&p->head, l, lines);
+
+ return 1;
+}
+
+void
+textplain_initparser(struct parser *p)
+{
+ memset(p, 0, sizeof(*p));
+
+ p->parse = &textplain_parse;
+ p->free = &textplain_free;
+
+ emit_line(p, LINE_PRE_START, NULL, 0);
+}
+
+static inline int
+append(struct parser *p, const char *buf, size_t len)
+{
+ size_t newlen;
+ char *t;
+
+ newlen = len + p->len;
+ if ((t = calloc(1, newlen)) == NULL)
+ return 0;
+ memcpy(t, p->buf, p->len);
+ memcpy(t + p->len, buf, len);
+ free(p->buf);
+ p->buf = t;
+ p->len = newlen;
+ return 1;
+}
+
+static inline int
+set_buf(struct parser *p, const char *buf, size_t len)
+{
+ free(p->buf);
+ p->buf = NULL;
+
+ if (len == 0) {
+ p->len = 0;
+ return 1;
+ }
+
+ if ((p->buf = calloc(1, len)) == NULL)
+ return 0;
+ memcpy(p->buf, buf, len);
+ p->len = len;
+ return 1;
+}
+
+static int
+textplain_parse(struct parser *p, const char *buf, size_t size)
+{
+ const char *b, *e;
+ size_t len, l;
+ int r;
+
+ if (p->len == 0) {
+ b = buf;
+ len = size;
+ } else {
+ if (!append(p, buf, size))
+ return 0;
+ b = p->buf;
+ len = p->len;
+ }
+
+ while (len > 0) {
+ if ((e = telescope_strnchr((char*)b, '\n', len)) == NULL)
+ break;
+ l = e - b;
+
+ r = emit_line(p, LINE_PRE_CONTENT, b, l);
+ if (!r)
+ return 0;
+
+ len -= l;
+ b += l;
+
+ if (len > 0) {
+ /* skip \n */
+ len--;
+ b++;
+ }
+ }
+
+ return set_buf(p, b, len);
+}
+
+static int
+textplain_free(struct parser *p)
+{
+ /* flush the buffer */
+ if (p->len != 0) {
+ if (!emit_line(p, LINE_PRE_CONTENT, p->buf, p->len))
+ return 0;
+ }
+
+ return emit_line(p, LINE_PRE_END, NULL, 0);
+}