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Mention the opengroup sed reference, add a check which is disabled at present.

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Glenn L McGrath 2003-03-09 02:39:29 +00:00
parent 505bd0f15a
commit d5eadea970
1 changed files with 43 additions and 23 deletions
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66
editors/sed.c
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@ -41,6 +41,8 @@
- no pattern space hold space storing / swapping (x, etc.)
- no labels / branching (: label, b, t, and friends)
- and lots, lots more.
Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
*/
#include <stdio.h>
@ -419,9 +421,20 @@ static char *parse_cmd_str(struct sed_cmd * const sed_cmd, const char *const cmd
sed_cmd->invert = 1;
idx++;
#ifdef SED_FEATURE_STRICT_CHECKING
/* According to the spec
* It is unspecified whether <blank>s can follow a '!' character,
* and conforming applications shall not follow a '!' character
* with <blank>s.
*/
if (isblank(cmdstr[idx]) {
error_msg_and_die("blank follows '!'");
}
#else
/* skip whitespace before the command */
while (isspace(cmdstr[idx]))
idx++;
#endif
}
/* last part (mandatory) will be a command */
@ -429,29 +442,36 @@ static char *parse_cmd_str(struct sed_cmd * const sed_cmd, const char *const cmd
error_msg_and_die("missing command");
sed_cmd->cmd = cmdstr[idx];
/* if it was a single-letter command that takes no arguments (such as 'p'
* or 'd') all we need to do is increment the index past that command */
if (strchr("pd=", sed_cmd->cmd)) {
idx++;
}
/* handle (s)ubstitution command */
else if (sed_cmd->cmd == 's') {
idx += parse_subst_cmd(sed_cmd, &cmdstr[idx]);
}
/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
else if (strchr("aic", sed_cmd->cmd)) {
if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
error_msg_and_die("only a beginning address can be specified for edit commands");
idx += parse_edit_cmd(sed_cmd, &cmdstr[idx]);
}
/* handle file cmds: (r)ead */
else if (sed_cmd->cmd == 'r') {
if (sed_cmd->end_line || sed_cmd->end_match)
error_msg_and_die("Command only uses one address");
idx += parse_file_cmd(sed_cmd, &cmdstr[idx]);
}
else {
error_msg_and_die("Unsupported command %c", sed_cmd->cmd);
switch (sed_cmd->cmd) {
/* if it was a single-letter command that takes no arguments (such as 'p'
* or 'd') all we need to do is increment the index past that command */
case 'p':
case 'd':
case '=':
idx++;
break;
/* handle (s)ubstitution command */
case 's':
idx += parse_subst_cmd(sed_cmd, &cmdstr[idx]);
break;
/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
case 'a':
case 'i':
case 'c':
if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c') {
error_msg_and_die("only a beginning address can be specified for edit commands");
}
idx += parse_edit_cmd(sed_cmd, &cmdstr[idx]);
break;
/* handle file cmds: (r)ead */
case 'r':
if (sed_cmd->end_line || sed_cmd->end_match) {
error_msg_and_die("Command only uses one address");
}
idx += parse_file_cmd(sed_cmd, &cmdstr[idx]);
break;
default:
error_msg_and_die("Unsupported command %c", sed_cmd->cmd);
}
/* give back whatever's left over */