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Code Activity

(scm_flush_ws): Detect "#!"-style comments here.

Browse source 
(scm_lreadr): Abort on seeing "#!", which should no longer happen.
(skip_scsh_block_comment): Use scm_input_error instead of
scm_misc_error in case of EOF.
This commit is contained in:
Marius Vollmer 2004-09-07 09:18:59 +00:00
parent 242a43b5b3
commit 0520c32088
1 changed files with 47 additions and 40 deletions
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87
libguile/read.c
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@ -164,7 +164,37 @@ scm_grow_tok_buf (SCM *tok_buf)
return newdata;
}
/* Consume an SCSH-style block comment. Assume that we've already
read the initial `#!', and eat characters until we get a
newline/exclamation-point/sharp-sign/newline sequence.
A carriage return is also reocgnized as a newline. */
static void
skip_scsh_block_comment (SCM port)
{
int state = 0;
for (;;)
{
int c = scm_getc (port);
if (c == EOF)
scm_input_error ("skip_block_comment", port,
"unterminated `#! ... !#' comment", SCM_EOL);
if (state == 1 && c == '!')
state = 2;
else if (state == 2 && c == '#')
state = 3;
else if (state == 3 && (c == '\n' || c == '\r'))
return;
else if (c == '\n' || c == '\r')
state = 1;
else
state = 0;
}
}
int
scm_flush_ws (SCM port, const char *eoferr)
@ -195,6 +225,20 @@ scm_flush_ws (SCM port, const char *eoferr)
break;
}
break;
case '#':
switch (c = scm_getc (port))
{
case EOF:
eoferr = "read_sharp";
goto goteof;
case '!':
skip_scsh_block_comment (port);
break;
default:
scm_ungetc (c, port);
return '#';
}
break;
case SCM_LINE_INCREMENTORS:
case SCM_SINGLE_SPACES:
case '\t':
@ -284,39 +328,6 @@ recsexpr (SCM obj, long line, int column, SCM filename)
}
}
/* Consume an SCSH-style block comment. Assume that we've already
read the initial `#!', and eat characters until we get a
newline/exclamation-point/sharp-sign/newline sequence.
A carriage return is also reocgnized as a newline. */
static void
skip_scsh_block_comment (SCM port)
#define FUNC_NAME "skip_scsh_block_comment"
{
int state = 0;
for (;;)
{
int c = scm_getc (port);
if (c == EOF)
SCM_MISC_ERROR ("unterminated `#! ... !#' comment", SCM_EOL);
if (state == 1 && c == '!')
state = 2;
else if (state == 2 && c == '#')
state = 3;
else if (state == 3 && (c == '\n' || c == '\r'))
return;
else if (c == '\n' || c == '\r')
state = 1;
else
state = 0;
}
}
#undef FUNC_NAME
static SCM scm_get_hash_procedure(int c);
static SCM scm_i_lreadparen (SCM *, SCM, char *, SCM *, char);
@ -334,7 +345,6 @@ scm_lreadr (SCM *tok_buf, SCM port, SCM *copy)
tryagain:
c = scm_flush_ws (port, s_scm_read);
tryagain_no_flush_ws:
switch (c)
{
case EOF:
@ -443,12 +453,9 @@ scm_lreadr (SCM *tok_buf, SCM port, SCM *copy)
goto num;
case '!':
/* start of a shell script. Parse as a block comment,
terminated by !#, just like SCSH. */
skip_scsh_block_comment (port);
/* EOF is not an error here */
c = scm_flush_ws (port, (char *)NULL);
goto tryagain_no_flush_ws;
/* should never happen, #!...!# block comments are skipped
over in scm_flush_ws. */
abort ();
#if SCM_HAVE_ARRAYS
case '*':