From ec10b9d534d3c7c215144049b10df175aed02aa9 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Fri, 14 Jul 2000 01:13:11 +0000 Subject: Add in redimentary backtick suport (doesn't work properly yet, but is close). -Erik --- shell/lash.c | 113 ++++++++++++++++++++++++++++++++++++++--------------------- 1 file changed, 73 insertions(+), 40 deletions(-) (limited to 'shell/lash.c') diff --git a/shell/lash.c b/shell/lash.c index bb258c788..f4564f7f7 100644 --- a/shell/lash.c +++ b/shell/lash.c @@ -106,9 +106,9 @@ static int builtin_read(struct job *cmd, struct jobSet *junk); /* function prototypes for shell stuff */ static void checkJobs(struct jobSet *jobList); static int getCommand(FILE * source, char *command); -static int parseCommand(char **commandPtr, struct job *job, int *isBg); +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); static int busy_loop(FILE * input); @@ -389,6 +389,7 @@ static void freeJob(struct job *cmd) if (cmd->text) free(cmd->text); free(cmd->cmdBuf); + memset(cmd, 0, sizeof(struct job)); } /* remove a job from the jobList */ @@ -471,7 +472,7 @@ static int getCommand(FILE * source, char *command) char *promptStr; len=fprintf(stdout, "%s %s", cwd, prompt); fflush(stdout); - promptStr=(char*)malloc(sizeof(char)*(len+1)); + promptStr=(char*)xmalloc(sizeof(char)*(len+1)); sprintf(promptStr, "%s %s", cwd, prompt); cmdedit_read_input(promptStr, command); free( promptStr); @@ -550,7 +551,7 @@ static void globLastArgument(struct childProgram *prog, int *argcPtr, the beginning of the next command (if the original command had more then one job associated with it) or NULL if no more commands are present. */ -static int parseCommand(char **commandPtr, struct job *job, int *isBg) +static int parseCommand(char **commandPtr, struct job *job, struct jobSet *jobList, int *isBg) { char *command; char *returnCommand = NULL; @@ -569,14 +570,13 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) /* this handles empty lines or leading '#' characters */ if (!**commandPtr || (**commandPtr == '#')) { - job->numProgs = 0; - *commandPtr = NULL; + job->numProgs=0; return 0; } *isBg = 0; job->numProgs = 1; - job->progs = malloc(sizeof(*job->progs)); + job->progs = xmalloc(sizeof(*job->progs)); /* We set the argv elements to point inside of this string. The memory is freed by freeJob(). Allocate twice the original @@ -595,7 +595,7 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) prog->isStopped = 0; argvAlloced = 5; - prog->argv = malloc(sizeof(*prog->argv) * argvAlloced); + prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced); prog->argv[0] = job->cmdBuf; buf = command; @@ -688,6 +688,7 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) if (!*chptr) { fprintf(stderr, "file name expected after %c\n", *src); freeJob(job); + job->numProgs=0; return 1; } @@ -704,8 +705,9 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) if (*prog->argv[argc]) argc++; if (!argc) { - fprintf(stderr, "empty command in pipe\n"); + fprintf(stderr, "empty command in pipe1.\n"); freeJob(job); + job->numProgs=0; return 1; } prog->argv[argc] = NULL; @@ -721,7 +723,7 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) argc = 0; argvAlloced = 5; - prog->argv = malloc(sizeof(*prog->argv) * argvAlloced); + prog->argv = xmalloc(sizeof(*prog->argv) * argvAlloced); prog->argv[0] = ++buf; src++; @@ -729,7 +731,9 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) src++; if (!*src) { - fprintf(stderr, "empty command in pipe\n"); + fprintf(stderr, "empty command in pipe2\n"); + freeJob(job); + job->numProgs=0; return 1; } src--; /* we'll ++ it at the end of the loop */ @@ -746,13 +750,40 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) case '\\': src++; if (!*src) { - freeJob(job); fprintf(stderr, "character expected after \\\n"); + freeJob(job); return 1; } if (*src == '*' || *src == '[' || *src == ']' || *src == '?') *buf++ = '\\'; /* fallthrough */ + case '`': + /* Exec a backtick-ed command */ + { + char* newcmd=NULL; + char* ptr=NULL; + struct job newJob; + + ptr=strchr(++src, '`'); + if (ptr==NULL) { + fprintf(stderr, "Unmatched '`' in command\n"); + freeJob(job); + return 1; + } + + newcmd = xmalloc(1+ptr-src); + snprintf(newcmd, 1+ptr-src, src); + + if (!parseCommand(&newcmd, &newJob, jobList, isBg) && + newJob.numProgs) { + runCommand(&newJob, jobList, *isBg); + } + + /* Clip out the the backticked command from the string */ + memmove(--src, ptr, strlen(ptr)+1); + free(newcmd); + } + break; default: *buf++ = *src; } @@ -771,12 +802,12 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) prog->argv[argc] = NULL; if (!returnCommand) { - job->text = malloc(strlen(*commandPtr) + 1); + job->text = xmalloc(strlen(*commandPtr) + 1); strcpy(job->text, *commandPtr); } else { /* This leaves any trailing spaces, which is a bit sloppy */ count = returnCommand - *commandPtr; - job->text = malloc(count + 1); + job->text = xmalloc(count + 1); strncpy(job->text, *commandPtr, count); job->text[count] = '\0'; } @@ -787,7 +818,7 @@ static int parseCommand(char **commandPtr, struct job *job, int *isBg) } -static int runCommand(struct job newJob, struct jobSet *jobList, int inBg) +static int runCommand(struct job *newJob, struct jobSet *jobList, int inBg) { struct job *job; int i; @@ -800,8 +831,8 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg) nextin = 0, nextout = 1; - for (i = 0; i < newJob.numProgs; i++) { - if ((i + 1) < newJob.numProgs) { + for (i = 0; i < newJob->numProgs; i++) { + if ((i + 1) < newJob->numProgs) { pipe(pipefds); nextout = pipefds[1]; } else { @@ -810,12 +841,12 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg) /* Check if the command matches any non-forking builtins */ for (x = bltins; x->cmd; x++) { - if (!strcmp(newJob.progs[i].argv[0], x->cmd)) { - return (x->function(&newJob, jobList)); + if (!strcmp(newJob->progs[i].argv[0], x->cmd)) { + return (x->function(newJob, jobList)); } } - if (!(newJob.progs[i].pid = fork())) { + if (!(newJob->progs[i].pid = fork())) { signal(SIGTTOU, SIG_DFL); if (nextin != 0) { @@ -829,12 +860,12 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg) } /* explicit redirections override pipes */ - setupRedirections(newJob.progs + i); + setupRedirections(newJob->progs + i); /* Check if the command matches any of the other builtins */ for (x = bltins_forking; x->cmd; x++) { - if (!strcmp(newJob.progs[i].argv[0], x->cmd)) { - exit (x->function(&newJob, jobList)); + if (!strcmp(newJob->progs[i].argv[0], x->cmd)) { + exit (x->function(newJob, jobList)); } } #ifdef BB_FEATURE_SH_STANDALONE_SHELL @@ -842,24 +873,24 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg) /* TODO: Add matching when paths are 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) { + if (strcmp(newJob->progs[i].argv[0], a->name) == 0) { int argc; - char** argv=newJob.progs[i].argv; + char** argv=newJob->progs[i].argv; for(argc=0;*argv!=NULL; argv++, argc++); - exit((*(a->main)) (argc, newJob.progs[i].argv)); + exit((*(a->main)) (argc, newJob->progs[i].argv)); } a++; } #endif - execvp(newJob.progs[i].argv[0], newJob.progs[i].argv); - fatalError("%s: %s\n", newJob.progs[i].argv[0], + execvp(newJob->progs[i].argv[0], newJob->progs[i].argv); + fatalError("%s: %s\n", newJob->progs[i].argv[0], strerror(errno)); } /* put our child in the process group whose leader is the first process in this pipe */ - setpgid(newJob.progs[i].pid, newJob.progs[0].pid); + setpgid(newJob->progs[i].pid, newJob->progs[0].pid); if (nextin != 0) close(nextin); @@ -871,24 +902,24 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg) nextin = pipefds[0]; } - newJob.pgrp = newJob.progs[0].pid; + newJob->pgrp = newJob->progs[0].pid; /* find the ID for the job to use */ - newJob.jobId = 1; + newJob->jobId = 1; for (job = jobList->head; job; job = job->next) - if (job->jobId >= newJob.jobId) - newJob.jobId = job->jobId + 1; + if (job->jobId >= newJob->jobId) + newJob->jobId = job->jobId + 1; /* add the job to the list of running jobs */ if (!jobList->head) { - job = jobList->head = malloc(sizeof(*job)); + job = jobList->head = xmalloc(sizeof(*job)); } else { for (job = jobList->head; job->next; job = job->next); - job->next = malloc(sizeof(*job)); + job->next = xmalloc(sizeof(*job)); job = job->next; } - *job = newJob; + *job = *newJob; job->next = NULL; job->runningProgs = job->numProgs; job->stoppedProgs = 0; @@ -897,13 +928,13 @@ static int runCommand(struct job newJob, struct jobSet *jobList, int inBg) /* we don't wait for background jobs to return -- append it to the list of backgrounded jobs and leave it alone */ printf("[%d] %d\n", job->jobId, - newJob.progs[newJob.numProgs - 1].pid); + newJob->progs[newJob->numProgs - 1].pid); } else { jobList->fg = job; /* move the new process group into the foreground */ /* suppress messages when run from /linuxrc mag@sysgo.de */ - if (tcsetpgrp(0, newJob.pgrp) && errno != ENOTTY) + if (tcsetpgrp(0, newJob->pgrp) && errno != ENOTTY) perror("tcsetpgrp"); } @@ -982,9 +1013,11 @@ static int busy_loop(FILE * input) nextCommand = command; } - if (!parseCommand(&nextCommand, &newJob, &inBg) && + if (!parseCommand(&nextCommand, &newJob, &jobList, &inBg) && newJob.numProgs) { - runCommand(newJob, &jobList, inBg); + runCommand(&newJob, &jobList, inBg); + } else { + nextCommand=NULL; } } else { /* a job is running in the foreground; wait for it */ -- cgit v1.2.3