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Backtick support to infinite (memory limited) levels of nesting is

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now implemented...  So now busybox shell can do cool stuff like:

    /home/andersen/CVS/busybox # echo foo `wc README` bar
    foo 71 422 2951 README bar

I love writing cool new features....  Muhahahaha...  (I think this is
leaking a little bit of memory every time it expands a backtick process,
so I still needs to do a bit of cleanup...)
 -Erik
This commit is contained in:
Eric Andersen
2000-07-17 19:14:41 +00:00
parent bc0aed79a8
commit a1d187a8a8
3 changed files with 249 additions and 84 deletions
Download Patch File Download Diff File Expand all files Collapse all files

111
lash.c
View File

@@ -25,6 +25,11 @@
*
*/
#define BB_FEATURE_SH_BACKTICKS
#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
@@ -108,7 +113,7 @@ static void checkJobs(struct jobSet *jobList);
static int getCommand(FILE * source, char *command);
static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg);
static int setupRedirections(struct childProgram *prog);
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg);
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int outPipe[2]);
static int busy_loop(FILE * input);
@@ -420,6 +425,10 @@ static void checkJobs(struct jobSet *jobList)
break;
}
/* This happens on backticked commands */
if(job==NULL)
return;
if (WIFEXITED(status) || WIFSIGNALED(status)) {
/* child exited */
job->runningProgs--;
@@ -697,7 +706,7 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
if (*prog->argv[argc])
argc++;
if (!argc) {
errorMsg("empty command in pipe1\n");
errorMsg("empty command in pipe\n");
freeJob(job);
job->numProgs=0;
return 1;
@@ -723,7 +732,7 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
src++;
if (!*src) {
errorMsg("empty command in pipe2\n");
errorMsg("empty command in pipe\n");
freeJob(job);
job->numProgs=0;
return 1;
@@ -749,12 +758,16 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
if (*src == '*' || *src == '[' || *src == ']'
|| *src == '?') *buf++ = '\\';
/* fallthrough */
#ifdef BB_FEATURE_SH_BACKTICKS
case '`':
/* Exec a backtick-ed command */
{
char* newcmd=NULL;
char* charptr1=NULL, *charptr2;
char* ptr=NULL;
struct job newJob;
struct job *newJob;
struct jobSet njobList = { NULL, NULL };
int pipefd[2];
int size;
ptr=strchr(++src, '`');
if (ptr==NULL) {
@@ -763,19 +776,56 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
return 1;
}
newcmd = xmalloc(1+ptr-src);
snprintf(newcmd, 1+ptr-src, src);
/* Make a copy of any stuff left over in the command
* line after the second backtick */
charptr2 = xmalloc(strlen(ptr)+1);
memcpy(charptr2, ptr+1, strlen(ptr));
if (!parseCommand(&newcmd, &newJob, jobList, isBg) &&
newJob.numProgs) {
runCommand(&newJob, jobList, *isBg);
/* Make some space to hold just the backticked command */
charptr1 = xmalloc(1+ptr-src);
snprintf(charptr1, 1+ptr-src, src);
newJob = xmalloc(sizeof(struct job));
/* Now parse and run the backticked command */
if (!parseCommand(&charptr1, newJob, &njobList, isBg)
&& newJob->numProgs) {
pipe(pipefd);
runCommand(newJob, &njobList, 0, pipefd);
}
checkJobs(jobList);
free(charptr1);
/* Clip out the the backticked command from the string */
memmove(--src, ptr, strlen(ptr)+1);
free(newcmd);
/* Copy the output from the backtick-ed command into the
* command line, making extra room as needed */
--src;
charptr1 = xmalloc(BUFSIZ);
while ( (size=fullRead(pipefd[0], charptr1, BUFSIZ-1)) >0) {
int newSize=src - *commandPtr + size + 1 + strlen(charptr2);
if (newSize > BUFSIZ) {
*commandPtr=realloc(*commandPtr, src - *commandPtr +
size + 1 + strlen(charptr2));
}
memcpy(src, charptr1, size);
src+=size;
}
free(charptr1);
close(pipefd[0]);
if (*(src-1)=='\n')
--src;
/* Now paste into the *commandPtr all the stuff
* leftover after the second backtick */
memcpy(src, charptr2, strlen(charptr2));
fprintf(stderr,"*commandPtr='%s'\n", *commandPtr);
free(charptr2);
/* Now recursively call parseCommand to deal with the new
* and improved version of the command line with the backtick
* results expanded in place... */
return(parseCommand(commandPtr, job, jobList, isBg));
}
break;
#endif // BB_FEATURE_SH_BACKTICKS
default:
*buf++ = *src;
}
@@ -810,25 +860,23 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
}
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int outPipe[2])
{
struct job *job;
int nextin=0, nextout, stdoutfd=fileno(stdout);
int i;
int nextin, nextout;
int pipefds[2]; /* pipefd[0] is for reading */
struct builtInCommand *x;
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
const struct BB_applet *a = applets;
#endif
nextin = 0, nextout = 1;
for (i = 0; i < newJob->numProgs; i++) {
if ((i + 1) < newJob->numProgs) {
pipe(pipefds);
nextout = pipefds[1];
} else {
nextout = 1;
nextout = stdoutfd;
}
/* Check if the command matches any non-forking builtins */
@@ -841,16 +889,17 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
if (!(newJob->progs[i].pid = fork())) {
signal(SIGTTOU, SIG_DFL);
if (nextin != 0) {
dup2(nextin, 0);
close(nextin);
}
if (nextout != 1) {
if (outPipe[1]!=-1) {
close(outPipe[0]);
nextout = stdoutfd = outPipe[1];
dup2(nextout, 1);
dup2(nextout, 2);
close(nextout);
}
//dup2(nextin, 0);
//close(nextin);
/* explicit redirections override pipes */
setupRedirections(newJob->progs + i);
@@ -862,8 +911,8 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
}
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
/* Check if the command matches any busybox internal commands here */
/* TODO: Add matching when paths are appended (i.e. 'cat' currently
* works, but '/bin/cat' doesn't ) */
/* TODO: Add matching on commands with paths appended (i.e. 'cat'
* currently works, but '/bin/cat' doesn't ) */
while (a->name != 0) {
if (strcmp(newJob->progs[i].argv[0], a->name) == 0) {
int argc;
@@ -879,6 +928,9 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
fatalError("%s: %s\n", newJob->progs[i].argv[0],
strerror(errno));
}
if (outPipe[1]!=-1) {
close(outPipe[1]);
}
/* put our child in the process group whose leader is the
first process in this pipe */
@@ -886,7 +938,7 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
if (nextin != 0)
close(nextin);
if (nextout != 1)
if (nextout != stdoutfd)
close(nextout);
/* If there isn't another process, nextin is garbage
@@ -1007,9 +1059,12 @@ static int busy_loop(FILE * input)
if (!parseCommand(&nextCommand, &newJob, &jobList, &inBg) &&
newJob.numProgs) {
runCommand(&newJob, &jobList, inBg);
int pipefds[2] = {-1,-1};
runCommand(&newJob, &jobList, inBg, pipefds);
} else {
nextCommand=NULL;
free(command);
command = (char *) calloc(BUFSIZ, sizeof(char));
}
} else {
/* a job is running in the foreground; wait for it */

111
sh.c
View File

@@ -25,6 +25,11 @@
*
*/
#define BB_FEATURE_SH_BACKTICKS
#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
@@ -108,7 +113,7 @@ static void checkJobs(struct jobSet *jobList);
static int getCommand(FILE * source, char *command);
static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg);
static int setupRedirections(struct childProgram *prog);
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg);
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int outPipe[2]);
static int busy_loop(FILE * input);
@@ -420,6 +425,10 @@ static void checkJobs(struct jobSet *jobList)
break;
}
/* This happens on backticked commands */
if(job==NULL)
return;
if (WIFEXITED(status) || WIFSIGNALED(status)) {
/* child exited */
job->runningProgs--;
@@ -697,7 +706,7 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
if (*prog->argv[argc])
argc++;
if (!argc) {
errorMsg("empty command in pipe1\n");
errorMsg("empty command in pipe\n");
freeJob(job);
job->numProgs=0;
return 1;
@@ -723,7 +732,7 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
src++;
if (!*src) {
errorMsg("empty command in pipe2\n");
errorMsg("empty command in pipe\n");
freeJob(job);
job->numProgs=0;
return 1;
@@ -749,12 +758,16 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
if (*src == '*' || *src == '[' || *src == ']'
|| *src == '?') *buf++ = '\\';
/* fallthrough */
#ifdef BB_FEATURE_SH_BACKTICKS
case '`':
/* Exec a backtick-ed command */
{
char* newcmd=NULL;
char* charptr1=NULL, *charptr2;
char* ptr=NULL;
struct job newJob;
struct job *newJob;
struct jobSet njobList = { NULL, NULL };
int pipefd[2];
int size;
ptr=strchr(++src, '`');
if (ptr==NULL) {
@@ -763,19 +776,56 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
return 1;
}
newcmd = xmalloc(1+ptr-src);
snprintf(newcmd, 1+ptr-src, src);
/* Make a copy of any stuff left over in the command
* line after the second backtick */
charptr2 = xmalloc(strlen(ptr)+1);
memcpy(charptr2, ptr+1, strlen(ptr));
if (!parseCommand(&newcmd, &newJob, jobList, isBg) &&
newJob.numProgs) {
runCommand(&newJob, jobList, *isBg);
/* Make some space to hold just the backticked command */
charptr1 = xmalloc(1+ptr-src);
snprintf(charptr1, 1+ptr-src, src);
newJob = xmalloc(sizeof(struct job));
/* Now parse and run the backticked command */
if (!parseCommand(&charptr1, newJob, &njobList, isBg)
&& newJob->numProgs) {
pipe(pipefd);
runCommand(newJob, &njobList, 0, pipefd);
}
checkJobs(jobList);
free(charptr1);
/* Clip out the the backticked command from the string */
memmove(--src, ptr, strlen(ptr)+1);
free(newcmd);
/* Copy the output from the backtick-ed command into the
* command line, making extra room as needed */
--src;
charptr1 = xmalloc(BUFSIZ);
while ( (size=fullRead(pipefd[0], charptr1, BUFSIZ-1)) >0) {
int newSize=src - *commandPtr + size + 1 + strlen(charptr2);
if (newSize > BUFSIZ) {
*commandPtr=realloc(*commandPtr, src - *commandPtr +
size + 1 + strlen(charptr2));
}
memcpy(src, charptr1, size);
src+=size;
}
free(charptr1);
close(pipefd[0]);
if (*(src-1)=='\n')
--src;
/* Now paste into the *commandPtr all the stuff
* leftover after the second backtick */
memcpy(src, charptr2, strlen(charptr2));
fprintf(stderr,"*commandPtr='%s'\n", *commandPtr);
free(charptr2);
/* Now recursively call parseCommand to deal with the new
* and improved version of the command line with the backtick
* results expanded in place... */
return(parseCommand(commandPtr, job, jobList, isBg));
}
break;
#endif // BB_FEATURE_SH_BACKTICKS
default:
*buf++ = *src;
}
@@ -810,25 +860,23 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
}
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int outPipe[2])
{
struct job *job;
int nextin=0, nextout, stdoutfd=fileno(stdout);
int i;
int nextin, nextout;
int pipefds[2]; /* pipefd[0] is for reading */
struct builtInCommand *x;
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
const struct BB_applet *a = applets;
#endif
nextin = 0, nextout = 1;
for (i = 0; i < newJob->numProgs; i++) {
if ((i + 1) < newJob->numProgs) {
pipe(pipefds);
nextout = pipefds[1];
} else {
nextout = 1;
nextout = stdoutfd;
}
/* Check if the command matches any non-forking builtins */
@@ -841,16 +889,17 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
if (!(newJob->progs[i].pid = fork())) {
signal(SIGTTOU, SIG_DFL);
if (nextin != 0) {
dup2(nextin, 0);
close(nextin);
}
if (nextout != 1) {
if (outPipe[1]!=-1) {
close(outPipe[0]);
nextout = stdoutfd = outPipe[1];
dup2(nextout, 1);
dup2(nextout, 2);
close(nextout);
}
//dup2(nextin, 0);
//close(nextin);
/* explicit redirections override pipes */
setupRedirections(newJob->progs + i);
@@ -862,8 +911,8 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
}
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
/* Check if the command matches any busybox internal commands here */
/* TODO: Add matching when paths are appended (i.e. 'cat' currently
* works, but '/bin/cat' doesn't ) */
/* TODO: Add matching on commands with paths appended (i.e. 'cat'
* currently works, but '/bin/cat' doesn't ) */
while (a->name != 0) {
if (strcmp(newJob->progs[i].argv[0], a->name) == 0) {
int argc;
@@ -879,6 +928,9 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
fatalError("%s: %s\n", newJob->progs[i].argv[0],
strerror(errno));
}
if (outPipe[1]!=-1) {
close(outPipe[1]);
}
/* put our child in the process group whose leader is the
first process in this pipe */
@@ -886,7 +938,7 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
if (nextin != 0)
close(nextin);
if (nextout != 1)
if (nextout != stdoutfd)
close(nextout);
/* If there isn't another process, nextin is garbage
@@ -1007,9 +1059,12 @@ static int busy_loop(FILE * input)
if (!parseCommand(&nextCommand, &newJob, &jobList, &inBg) &&
newJob.numProgs) {
runCommand(&newJob, &jobList, inBg);
int pipefds[2] = {-1,-1};
runCommand(&newJob, &jobList, inBg, pipefds);
} else {
nextCommand=NULL;
free(command);
command = (char *) calloc(BUFSIZ, sizeof(char));
}
} else {
/* a job is running in the foreground; wait for it */

111
shell/lash.c
View File

@@ -25,6 +25,11 @@
*
*/
#define BB_FEATURE_SH_BACKTICKS
#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
@@ -108,7 +113,7 @@ static void checkJobs(struct jobSet *jobList);
static int getCommand(FILE * source, char *command);
static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg);
static int setupRedirections(struct childProgram *prog);
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg);
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int outPipe[2]);
static int busy_loop(FILE * input);
@@ -420,6 +425,10 @@ static void checkJobs(struct jobSet *jobList)
break;
}
/* This happens on backticked commands */
if(job==NULL)
return;
if (WIFEXITED(status) || WIFSIGNALED(status)) {
/* child exited */
job->runningProgs--;
@@ -697,7 +706,7 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
if (*prog->argv[argc])
argc++;
if (!argc) {
errorMsg("empty command in pipe1\n");
errorMsg("empty command in pipe\n");
freeJob(job);
job->numProgs=0;
return 1;
@@ -723,7 +732,7 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
src++;
if (!*src) {
errorMsg("empty command in pipe2\n");
errorMsg("empty command in pipe\n");
freeJob(job);
job->numProgs=0;
return 1;
@@ -749,12 +758,16 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
if (*src == '*' || *src == '[' || *src == ']'
|| *src == '?') *buf++ = '\\';
/* fallthrough */
#ifdef BB_FEATURE_SH_BACKTICKS
case '`':
/* Exec a backtick-ed command */
{
char* newcmd=NULL;
char* charptr1=NULL, *charptr2;
char* ptr=NULL;
struct job newJob;
struct job *newJob;
struct jobSet njobList = { NULL, NULL };
int pipefd[2];
int size;
ptr=strchr(++src, '`');
if (ptr==NULL) {
@@ -763,19 +776,56 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
return 1;
}
newcmd = xmalloc(1+ptr-src);
snprintf(newcmd, 1+ptr-src, src);
/* Make a copy of any stuff left over in the command
* line after the second backtick */
charptr2 = xmalloc(strlen(ptr)+1);
memcpy(charptr2, ptr+1, strlen(ptr));
if (!parseCommand(&newcmd, &newJob, jobList, isBg) &&
newJob.numProgs) {
runCommand(&newJob, jobList, *isBg);
/* Make some space to hold just the backticked command */
charptr1 = xmalloc(1+ptr-src);
snprintf(charptr1, 1+ptr-src, src);
newJob = xmalloc(sizeof(struct job));
/* Now parse and run the backticked command */
if (!parseCommand(&charptr1, newJob, &njobList, isBg)
&& newJob->numProgs) {
pipe(pipefd);
runCommand(newJob, &njobList, 0, pipefd);
}
checkJobs(jobList);
free(charptr1);
/* Clip out the the backticked command from the string */
memmove(--src, ptr, strlen(ptr)+1);
free(newcmd);
/* Copy the output from the backtick-ed command into the
* command line, making extra room as needed */
--src;
charptr1 = xmalloc(BUFSIZ);
while ( (size=fullRead(pipefd[0], charptr1, BUFSIZ-1)) >0) {
int newSize=src - *commandPtr + size + 1 + strlen(charptr2);
if (newSize > BUFSIZ) {
*commandPtr=realloc(*commandPtr, src - *commandPtr +
size + 1 + strlen(charptr2));
}
memcpy(src, charptr1, size);
src+=size;
}
free(charptr1);
close(pipefd[0]);
if (*(src-1)=='\n')
--src;
/* Now paste into the *commandPtr all the stuff
* leftover after the second backtick */
memcpy(src, charptr2, strlen(charptr2));
fprintf(stderr,"*commandPtr='%s'\n", *commandPtr);
free(charptr2);
/* Now recursively call parseCommand to deal with the new
* and improved version of the command line with the backtick
* results expanded in place... */
return(parseCommand(commandPtr, job, jobList, isBg));
}
break;
#endif // BB_FEATURE_SH_BACKTICKS
default:
*buf++ = *src;
}
@@ -810,25 +860,23 @@ static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobLi
}
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg, int outPipe[2])
{
struct job *job;
int nextin=0, nextout, stdoutfd=fileno(stdout);
int i;
int nextin, nextout;
int pipefds[2]; /* pipefd[0] is for reading */
struct builtInCommand *x;
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
const struct BB_applet *a = applets;
#endif
nextin = 0, nextout = 1;
for (i = 0; i < newJob->numProgs; i++) {
if ((i + 1) < newJob->numProgs) {
pipe(pipefds);
nextout = pipefds[1];
} else {
nextout = 1;
nextout = stdoutfd;
}
/* Check if the command matches any non-forking builtins */
@@ -841,16 +889,17 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
if (!(newJob->progs[i].pid = fork())) {
signal(SIGTTOU, SIG_DFL);
if (nextin != 0) {
dup2(nextin, 0);
close(nextin);
}
if (nextout != 1) {
if (outPipe[1]!=-1) {
close(outPipe[0]);
nextout = stdoutfd = outPipe[1];
dup2(nextout, 1);
dup2(nextout, 2);
close(nextout);
}
//dup2(nextin, 0);
//close(nextin);
/* explicit redirections override pipes */
setupRedirections(newJob->progs + i);
@@ -862,8 +911,8 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
}
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
/* Check if the command matches any busybox internal commands here */
/* TODO: Add matching when paths are appended (i.e. 'cat' currently
* works, but '/bin/cat' doesn't ) */
/* TODO: Add matching on commands with paths appended (i.e. 'cat'
* currently works, but '/bin/cat' doesn't ) */
while (a->name != 0) {
if (strcmp(newJob->progs[i].argv[0], a->name) == 0) {
int argc;
@@ -879,6 +928,9 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
fatalError("%s: %s\n", newJob->progs[i].argv[0],
strerror(errno));
}
if (outPipe[1]!=-1) {
close(outPipe[1]);
}
/* put our child in the process group whose leader is the
first process in this pipe */
@@ -886,7 +938,7 @@ static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg)
if (nextin != 0)
close(nextin);
if (nextout != 1)
if (nextout != stdoutfd)
close(nextout);
/* If there isn't another process, nextin is garbage
@@ -1007,9 +1059,12 @@ static int busy_loop(FILE * input)
if (!parseCommand(&nextCommand, &newJob, &jobList, &inBg) &&
newJob.numProgs) {
runCommand(&newJob, &jobList, inBg);
int pipefds[2] = {-1,-1};
runCommand(&newJob, &jobList, inBg, pipefds);
} else {
nextCommand=NULL;
free(command);
command = (char *) calloc(BUFSIZ, sizeof(char));
}
} else {
/* a job is running in the foreground; wait for it */