84 lines
1.4 KiB
C
Executable File
84 lines
1.4 KiB
C
Executable File
/*
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* Do filename expansion with the shell.
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*/
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#define EXPAND_BUF 2048
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#include "sysincludes.h"
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#include "mtools.h"
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int safePopenOut(char **command, char *output, int len)
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{
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int pipefd[2];
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pid_t pid;
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int status;
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int last;
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if(pipe(pipefd)) {
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return -2;
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}
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switch((pid=fork())){
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case -1:
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return -2;
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case 0: /* the son */
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close(pipefd[0]);
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destroy_privs();
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close(1);
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close(2); /* avoid nasty error messages on stderr */
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dup(pipefd[1]);
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close(pipefd[1]);
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execvp(command[0], command+1);
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exit(1);
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default:
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close(pipefd[1]);
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break;
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}
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last=read(pipefd[0], output, len);
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kill(pid,9);
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wait(&status);
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if(last<0) {
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return -1;
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}
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return last;
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}
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const char *expand(const char *input, char *ans)
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{
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int last;
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char buf[256];
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char *command[] = { "/bin/sh", "sh", "-c", 0, 0 };
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ans[EXPAND_BUF-1]='\0';
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if (input == NULL)
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return(NULL);
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if (*input == '\0')
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return("");
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/* any thing to expand? */
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if (!strpbrk(input, "$*(){}[]\\?`~")) {
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strncpy(ans, input, EXPAND_BUF-1);
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return(ans);
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}
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/* popen an echo */
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#ifdef HAVE_SNPRINTF
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snprintf(buf, 255, "echo %s", input);
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#else
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sprintf(buf, "echo %s", input);
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#endif
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command[3]=buf;
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last=safePopenOut(command, ans, EXPAND_BUF-1);
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if(last<0) {
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perror("Pipe read error");
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exit(1);
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}
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if(last)
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ans[last-1] = '\0';
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else
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strncpy(ans, input, EXPAND_BUF-1);
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return ans;
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}
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