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/*
\funcref{fun\_backtick}{void fun\_backtick ()}
{}
{}
{}
{fun\_exec()}
{funsyste.c}
{
This function expects a string as last pushed {\em e\_str}
value. The string is executed through a {\em system()} call (if this
fails, an error is issued) and the standard output produced by the
call is returned as a list, one element for each line. If the list
contains zero elements the command has failed. A command not producing
any output will at least result in a list having one (empty) string.
}
*/
#include "builtin.ih"
void fun_backtick()
{
char const *cmd = stringStr(top()); /* get cmd string */
FILE *fpipe = popen(cmd, "r"); /* and open a pipe */
if (echo) /* re-echo if requested */
printf("`%s`\n", cmd);
reg = *listConstructor();
if (!fpipe) /* command failed */
return; /* then empty list return */
{
char *line;
while ((line = getLine(fpipe)))
listAdd_swallow_cP(®, line);
}
pclose(fpipe);
}
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