Add cstuff_file_get_lines function

file.c

@@ -83,3 +83,59 @@ cstuff_file_move(const char *src, const char *dest)
 
 	return rc;
 }
+
+
+CStuffRetcode
+cstuff_file_get_lines(const char *src, CStuffFileGetLine get_line)
+{
+	FILE *f = NULL;
+	size_t sz = 256;
+	char *line;
+	ssize_t rs;
+	CStuffRetcode result = CSTUFF_SUCCESS;
+
+	if (!(line = malloc(sz)))
+		goto e_malloc;
+
+	if (!(f = fopen(src, "r")))
+		goto e_syscall;
+
+	while ((rs = getdelim(&line, &sz, '\n', f)) != -1) {
+		if (!get_line(line, rc)) {
+			continue;
+		} else {
+			goto e_input;
+		}
+	}
+
+	switch(errno) {
+	case 0:
+		break;
+
+	case ENOMEM:
+		goto e_malloc;
+
+	default:
+		goto e_syscall;
+	}
+	goto finally;
+
+e_input:
+	result = CSTUFF_INPUT_ERROR;
+	goto finally;
+
+e_malloc:
+	result = CSTUFF_MALLOC_ERROR;
+	goto finally;
+
+e_syscall:
+	result = CSTUFF_SYSCALL_ERROR;
+	goto finally;
+
+finally:
+	if (line)
+		free(line);
+	if (f)
+		fclose(f);
+	return result;
+}

file.h

@@ -20,6 +20,9 @@
 #include "retcode.h"
 
 
+typedef int
+(*CStuffFileGetLine)(char *line, ssize_t length, void *ctx);
+
 bool
 cstuff_file_exists(const char *file);
 
@@ -32,4 +35,7 @@ CStuffRetcode
 cstuff_file_move(const char *src, const char *dest);
 
 
+CStuffRetcode
+cstuff_file_get_lines(const char *src, CStuffFileGetLine get_line, void *ctx);
+
 #endif /* !FILE_H */