lib: Add fgets_slash

Copy x_fgets_slash with conversion to stdio and talloc.

Probably I'd do this functionality a bit differently, but for simplicity I
chose to make it the same as what is there.

Signed-off-by: Volker Lendecke <[email protected]>
Reviewed-by: Jeremy Allison <[email protected]>

lib/util/samba_util.h

@@ -336,6 +336,8 @@ const char **str_list_make_v3_const(TALLOC_CTX *mem_ctx,
  */
 _PUBLIC_ char *afdgets(int fd, TALLOC_CTX *mem_ctx, size_t hint);
 
+char *fgets_slash(TALLOC_CTX *mem_ctx, char *s2, int maxlen, FILE *f);
+
 /**
 load a file into memory from a fd.
 **/

lib/util/util_file.c

@@ -79,6 +79,88 @@ _PUBLIC_ char *afdgets(int fd, TALLOC_CTX *mem_ctx, size_t hint)
 	return data;
 }
 
+char *fgets_slash(TALLOC_CTX *mem_ctx, char *s2, int maxlen, FILE *f)
+{
+	char *s = s2;
+	int len = 0;
+	int c;
+	bool start_of_line = true;
+
+	if (feof(f)) {
+		return NULL;
+	}
+
+	if (maxlen < 2) {
+		return NULL;
+	}
+
+	if (s2 == NULL) {
+		maxlen = MIN(maxlen,8);
+		s = talloc_array(mem_ctx, char, maxlen);
+	}
+
+	if (s == NULL) {
+		return NULL;
+	}
+
+	*s = 0;
+
+	while (len < maxlen-1) {
+		c = getc(f);
+		switch (c)
+		{
+		    case '\r':
+			    break;
+		    case '\n':
+			    while (len > 0 && s[len-1] == ' ') {
+				    s[--len] = 0;
+			    }
+			    if (len > 0 && s[len-1] == '\\') {
+				    s[--len] = 0;
+				    start_of_line = true;
+				    break;
+			    }
+			    return s;
+		    case EOF:
+			    if (len <= 0 && (s2 == NULL)) {
+				    TALLOC_FREE(s);
+			    }
+			    return (len>0) ? s : NULL;
+		    case ' ':
+			    if (start_of_line) {
+				    break;
+			    }
+			    /* fall through */
+		    default:
+			    start_of_line = false;
+			    s[len++] = c;
+			    s[len] = 0;
+		}
+		if ((s2 == NULL) && (len > maxlen-3)) {
+			int m;
+			char *t;
+
+			m = maxlen * 2;
+			if (m < maxlen) {
+				DBG_ERR("length overflow");
+				TALLOC_FREE(s);
+				return NULL;
+			}
+			maxlen = m;
+
+			t = talloc_realloc(mem_ctx, s, char, maxlen);
+			if (t == NULL) {
+				DBG_ERR("failed to expand buffer!\n");
+				TALLOC_FREE(s);
+				return NULL;
+			}
+
+			s = t;
+		}
+	}
+
+	return s;
+}
 
 /**
 load a file into memory from a fd.