popt/poptconfig.c

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/** \ingroup popt
 * \file popt/poptconfig.c
 */

/* (C) 1998-2002 Red Hat, Inc. -- Licensing details are in the COPYING
   file accompanying popt source distributions, available from 
   ftp://ftp.rpm.org/pub/rpm/dist. */

#include "system.h"
#include "poptint.h"

/*@-compmempass@*/      /* FIX: item->option.longName kept, not dependent. */
static void configLine(poptContext con, char * line)
        /*@modifies con @*/
{
    /*@-type@*/
    int nameLength = strlen(con->appName);
    /*@=type@*/
    const char * entryType;
    const char * opt;
    poptItem item = alloca(sizeof(*item));
    int i, j;
    
/*@-boundswrite@*/
    memset(item, 0, sizeof(*item));

    /*@-type@*/
    if (strncmp(line, con->appName, nameLength)) return;
    /*@=type@*/

    line += nameLength;
    if (*line == '\0' || !isspace(*line)) return;

    while (*line != '\0' && isspace(*line)) line++;
    entryType = line;
    while (*line == '\0' || !isspace(*line)) line++;
    *line++ = '\0';

    while (*line != '\0' && isspace(*line)) line++;
    if (*line == '\0') return;
    opt = line;
    while (*line == '\0' || !isspace(*line)) line++;
    *line++ = '\0';

    while (*line != '\0' && isspace(*line)) line++;
    if (*line == '\0') return;

    /*@-temptrans@*/ /* FIX: line alias is saved */
    if (opt[0] == '-' && opt[1] == '-')
        item->option.longName = opt + 2;
    else if (opt[0] == '-' && opt[2] == '\0')
        item->option.shortName = opt[1];
    /*@=temptrans@*/

    if (poptParseArgvString(line, &item->argc, &item->argv)) return;

    /*@-modobserver@*/
    item->option.argInfo = POPT_ARGFLAG_DOC_HIDDEN;
    for (i = 0, j = 0; i < item->argc; i++, j++) {
        const char * f;
        if (!strncmp(item->argv[i], "--POPTdesc=", sizeof("--POPTdesc=")-1)) {
            f = item->argv[i] + sizeof("--POPTdesc=");
            if (f[0] == '$' && f[1] == '"') f++;
            item->option.descrip = f;
            item->option.argInfo &= ~POPT_ARGFLAG_DOC_HIDDEN;
            j--;
        } else
        if (!strncmp(item->argv[i], "--POPTargs=", sizeof("--POPTargs=")-1)) {
            f = item->argv[i] + sizeof("--POPTargs=");
            if (f[0] == '$' && f[1] == '"') f++;
            item->option.argDescrip = f;
            item->option.argInfo &= ~POPT_ARGFLAG_DOC_HIDDEN;
            item->option.argInfo |= POPT_ARG_STRING;
            j--;
        } else
        if (j != i)
            item->argv[j] = item->argv[i];
    }
    if (j != i) {
        item->argv[j] = NULL;
        item->argc = j;
    }
    /*@=modobserver@*/
/*@=boundswrite@*/

    /*@-nullstate@*/ /* FIX: item->argv[] may be NULL */
    if (!strcmp(entryType, "alias"))
        (void) poptAddItem(con, item, 0);
    else if (!strcmp(entryType, "exec"))
        (void) poptAddItem(con, item, 1);
    /*@=nullstate@*/
}
/*@=compmempass@*/

int poptReadConfigFile(poptContext con, const char * fn)
{
    const char * file, * chptr, * end;
    char * buf;
/*@dependent@*/ char * dst;
    int fd, rc;
    off_t fileLength;

    fd = open(fn, O_RDONLY);
    if (fd < 0)
        return (errno == ENOENT ? 0 : POPT_ERROR_ERRNO);

    fileLength = lseek(fd, 0, SEEK_END);
    if (fileLength == -1 || lseek(fd, 0, 0) == -1) {
        rc = errno;
        (void) close(fd);
        /*@-mods@*/
        errno = rc;
        /*@=mods@*/
        return POPT_ERROR_ERRNO;
    }

    file = alloca(fileLength + 1);
    if (read(fd, (char *)file, fileLength) != fileLength) {
        rc = errno;
        (void) close(fd);
        /*@-mods@*/
        errno = rc;
        /*@=mods@*/
        return POPT_ERROR_ERRNO;
    }
    if (close(fd) == -1)
        return POPT_ERROR_ERRNO;

/*@-boundswrite@*/
    dst = buf = alloca(fileLength + 1);

    chptr = file;
    end = (file + fileLength);
    /*@-infloops@*/     /* LCL: can't detect chptr++ */
    while (chptr < end) {
        switch (*chptr) {
          case '\n':
            *dst = '\0';
            dst = buf;
            while (*dst && isspace(*dst)) dst++;
            if (*dst && *dst != '#')
                configLine(con, dst);
            chptr++;
            /*@switchbreak@*/ break;
          case '\\':
            *dst++ = *chptr++;
            if (chptr < end) {
                if (*chptr == '\n') 
                    dst--, chptr++;     
                    /* \ at the end of a line does not insert a \n */
                else
                    *dst++ = *chptr++;
            }
            /*@switchbreak@*/ break;
          default:
            *dst++ = *chptr++;
            /*@switchbreak@*/ break;
        }
    }
    /*@=infloops@*/
/*@=boundswrite@*/

    return 0;
}

int poptReadDefaultConfig(poptContext con, /*@unused@*/ int useEnv)
{
    char * fn, * home;
    int rc;

    /*@-type@*/
    if (!con->appName) return 0;
    /*@=type@*/

    rc = poptReadConfigFile(con, "/etc/popt");
    if (rc) return rc;
#if defined(HAVE_GETUID) && defined(HAVE_GETEUID)
    if (getuid() != geteuid()) return 0;
#endif

    if ((home = getenv("HOME"))) {
        fn = alloca(strlen(home) + 20);
        strcpy(fn, home);
        strcat(fn, "/.popt");
        rc = poptReadConfigFile(con, fn);
        if (rc) return rc;
    }

    return 0;
}

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