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util.c
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util.c
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/*
** util.c
**
** Made by (Matthieu Lucotte)
** Login <gounter@users.sourceforge.net>
**
** Started on Tue Oct 2 20:28:27 2001 Matthieu Lucotte
** Last update Mon Sep 1 23:01:34 2003
*/
#include "zssh.h"
/* shift position i by n chars
* Ex : str_shift("1234567",2,3) -> "1267"
* |||
*/
void str_shift(char *str, int i, int n)
{
int j;
for (j = i; str[j + n]; j++)
str[j] = str[j + n];
str[j] = str[j + n];
}
char *str_n_dup(char *str, int n)
{
char *pt;
int i;
int len;
len = min(strlen(str), n);
pt = smalloc(len + 1);
for (i = 0; i < len; i++)
pt[i] = str[i];
pt[len] = 0;
return pt;
}
char *str_cat(char *str1, char *str2)
{
int i;
int len1;
int len2;
char *str_res;
len1 = strlen(str1);
len2 = strlen(str2);
if ((str_res = smalloc(len1 + len2 + 1)) == 0)
return 0;
for (i = 0; i < len1; i++)
str_res[i] = str1[i];
for (i = 0; i <= len2; i++)
str_res[len1 + i] = str2[i];
return str_res;
}
void str_sub_repl(char **str, int sub_beg, int sub_len, char *sub_repl)
{
char *s1;
char *s2;
s1 = s2 = str_n_dup(*str, sub_beg);
s1 = str_cat(s1, sub_repl);
free(s2);
s2 = s1;
s1 = str_cat(s1, *str + sub_beg + sub_len);
free(s2);
free(*str);
*str = s1;
}
void *smalloc(unsigned int n)
{
void *pt;
if ((pt = malloc(n)) != 0)
return pt;
error(0, "malloc");
exit(1);
}
/*int sfork() */
/*{ */
/* int pid; */
/* */
/* pid = fork(); */
/* if (pid == -1) */
/* error(0,"fork"); */
/* return (pid); */
/*} */
/* sfork(): Exits if unable to fork
* if pid_child is non zero, also avoids race condition that would occur
* if the child's pid must be known by the parent *before* the child dies.
*/
int sfork(volatile sig_atomic_t *pid_child)
{
sigset_t mask;
sigset_t old_mask;
int pid;
sigprocmask(SIG_SETMASK, 0, &old_mask); /* save mask */
sigprocmask(SIG_SETMASK, 0, &mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_SETMASK, &mask, 0); /* block SIGCHLD */
pid = fork();
if (pid == -1)
error(0, "fork");
if (pid) /* parent process */
if (pid_child)
*pid_child = pid;
sigprocmask(SIG_SETMASK, &old_mask, 0); /* restore old mask */
return pid;
}
void copy_rz_stream(int read_fd, int write_fd) {
ssize_t cr, cw;
char buf[ZSSH_IO_BUFSIZ];
while (gl_child_rz) {
cr = read(read_fd, buf, sizeof(buf)); /* read from ssh pty */
if (cr <= 0)
break;
cw = write(write_fd, buf, cr); /* write to hook process */
if (cw < 0) {
break;
}
if (cr != cw) {
fprintf(stderr, "error: partial write, %zd != %zd\n", cr, cw);
}
}
}