X-Git-Url: https://diplodocus.org/git/nmh/blobdiff_plain/64cc8937ff11ffd37736f27ceed5f4ff93161ca7..eebb7379a6a85da02e41d6c222b321fa80d148d1:/sbr/utils.c?ds=sidebyside diff --git a/sbr/utils.c b/sbr/utils.c index 81620567..fff1aacd 100644 --- a/sbr/utils.c +++ b/sbr/utils.c @@ -9,9 +9,15 @@ #include #include -#include #include -#include + +/* sbr/signals.c */ +extern int setup_signal_handlers(); + +/* sbr/m_mktemp.c */ +extern void remove_registered_files_atexit(); + +extern char *mhdocdir; /* * We allocate space for messages (msgs array) @@ -19,44 +25,75 @@ */ #define MAXMSGS 256 -/* - * Safely call malloc - */ -void * -mh_xmalloc(size_t size) +/* Call malloc(3), exiting on NULL return. */ +void *mh_xmalloc(size_t size) { - void *memory; + void *p; if (size == 0) - adios(NULL, "Tried to malloc 0 bytes"); - - memory = malloc(size); - if (!memory) - adios(NULL, "Malloc failed"); + size = 1; /* Some mallocs don't like 0. */ + p = malloc(size); + if (!p) + adios(NULL, "malloc failed, size wanted: %zu", size); - return memory; + return p; } -/* - * Safely call realloc - */ -void * -mh_xrealloc(void *ptr, size_t size) +/* Call realloc(3), exiting on NULL return. */ +void *mh_xrealloc(void *ptr, size_t size) { - void *memory; + void *new; - /* Some non-POSIX realloc()s don't cope with realloc(NULL,sz) */ + /* Copy POSIX behaviour, coping with non-POSIX systems. */ + if (size == 0) { + if (ptr) { + free(ptr); + } + return mh_xmalloc(1); /* Get a unique pointer. */ + } if (!ptr) return mh_xmalloc(size); - if (size == 0) - adios(NULL, "Tried to realloc 0bytes"); + new = realloc(ptr, size); + if (!new) + adios(NULL, "realloc failed, size wanted: %zu", size); + + return new; +} + +/* Call calloc(3), exiting on NULL return. */ +void *mh_xcalloc(size_t nelem, size_t elsize) +{ + void *p; + + if (!nelem || !elsize) + return mh_xmalloc(1); /* Get a unique pointer. */ + + p = calloc(nelem, elsize); + if (!p) + adios(NULL, "calloc failed, size wanted: %zu * %zu", nelem, elsize); + + return p; +} + +/* Duplicate a NUL-terminated string, exit on failure. */ +char *mh_xstrdup(const char *src) +{ + size_t n; + char *dest; - memory = realloc(ptr, size); - if (!memory) - adios(NULL, "Realloc failed"); + n = strlen(src) + 1; /* Ignore possibility of overflow. */ + dest = mh_xmalloc(n); + memcpy(dest, src, n); - return memory; + return dest; +} + +/* Call free(3), if ptr isn't NULL. */ +void mh_xfree(void *ptr) +{ + if (ptr) + free(ptr); /* Some very old platforms can't cope with NULL. */ } /* @@ -66,7 +103,7 @@ mh_xrealloc(void *ptr, size_t size) char * pwd(void) { - register char *cp; + char *cp; static char curwd[PATH_MAX]; if (!getcwd (curwd, PATH_MAX)) { @@ -74,7 +111,9 @@ pwd(void) if (!mypath || !*mypath || (strcpy (curwd, mypath), chdir (curwd)) == -1) { strcpy (curwd, "/"); - chdir (curwd); + if (chdir (curwd) < 0) { + advise (curwd, "chdir"); + } } return curwd; } @@ -175,7 +214,7 @@ void create_folder(char *folder, int autocreate, void (*done_callback)(int)) if (autocreate == 0) { /* ask before creating folder */ cp = concat ("Create folder \"", folder, "\"? ", NULL); - if (!getanswer (cp)) + if (!read_yes_or_no_if_tty (cp)) done_callback (1); free (cp); } else if (autocreate == -1) { @@ -319,3 +358,192 @@ nmh_strcasestr (const char *s1, const char *s2) { return NULL; } + + +/* EndsWithC returns true if non-NULL string s ends with a c before the + * terminating NUL. */ +bool EndsWithC(char *s, int c) +{ + return *s && s[strlen(s) - 1] == c; +} + + +/* TrimSuffixC deletes c from the end of non-NULL string s if it's + * present, shortening s by 1. Only one instance of c is removed. */ +void TrimSuffixC(char *s, int c) +{ + if (!*s) + return; + + s += strlen(s) - 1; + if (*s == c) + *s = '\0'; +} + + +int +nmh_init(const char *argv0, int read_context) { + int status = OK; + char *locale; + + invo_name = r1bindex ((char *) argv0, '/'); + + if (setup_signal_handlers()) { + admonish("sigaction", "unable to set up signal handlers"); + } + + /* POSIX atexit() does not define any error conditions. */ + if (atexit(remove_registered_files_atexit)) { + admonish("atexit", "unable to register atexit function"); + } + + /* Read context, if supposed to. */ + if (read_context) { + int allow_version_check = 1; + int check_older_version = 0; + char *cp; + + context_read(); + + if (read_context != 1 || + ((cp = context_find ("Welcome")) && strcasecmp (cp, "disable") == 0)) { + allow_version_check = 0; + } else if ((cp = getenv ("MHCONTEXT")) != NULL && *cp != '\0') { + /* Context file comes from $MHCONTEXT, so only print the message + if the context file has an older version. If it does, or if it + doesn't have a version at all, update the version. */ + check_older_version = 1; + } + + /* Check to see if the user is running a different (or older, if + specified) version of nmh than they had run bfore, and notify them + if so. But only if read_context was set to a value to enable. */ + if (allow_version_check && isatty (fileno (stdin)) && + isatty (fileno (stdout)) && isatty (fileno (stderr))) { + if (nmh_version_changed (check_older_version)) { + printf ("===================================================" + "=====================\n"); + printf ("Welcome to nmh version %s\n\n", VERSION); + printf ("See the release notes in %s/NEWS\n\n", + mhdocdir); + print_intro (stdout, 1); + printf ("\nThis message will not be repeated until " + "nmh is next updated.\n"); + printf ("===================================================" + "=====================\n\n"); + + fputs ("Press enter to continue: ", stdout); + (void) read_line (); + putchar ('\n'); + } + } + } else { + if ((status = context_foil(NULL)) != OK) { + advise("", "failed to create minimal profile/context"); + } + } + + /* Allow the user to set a locale in their profile. Otherwise, use the + "" string to pull it from their environment, see setlocale(3). */ + if ((locale = context_find ("locale")) == NULL) { + locale = ""; + } + + if (! setlocale (LC_ALL, locale)) { + admonish (NULL, "setlocale failed, check your LC_ALL, LC_CTYPE, and " + "LANG environment variables"); + } + + return status; +} + + +/* + * Check stored version, and return 1 if out-of-date or non-existent. + * Because the output of "mhparam version" is prefixed with "nmh-", + * use that prefix here. + */ +int +nmh_version_changed (int older) { + const char *const context_version = context_find("Version"); + + if (older) { + /* Convert the version strings to floats and compare them. This will + break for versions with multiple decimal points, etc. */ + const float current_version = strtof (VERSION, NULL); + const float old_version = + context_version && strncmp (context_version, "nmh-", 4) == 0 + ? strtof (context_version + 4, NULL) + : 99999999; + + if (context_version == NULL || old_version < current_version) { + context_replace ("Version", "nmh-" VERSION); + } + + return old_version < current_version ? 1 : 0; + } else { + if (context_version == NULL || strcmp(context_version, "nmh-" VERSION) != 0) { + context_replace ("Version", "nmh-" VERSION); + + return 1; + } else { + return 0; + } + } +} + + +/* Returns copy of argument str with all characters converted to upper + case, and trimmed whitespace (see cpytrim()) . */ +char * +upcase (const char *str) { + char *up = cpytrim (str); + char *cp; + + for (cp = up; *cp; ++cp) { *cp = toupper ((unsigned char) *cp); } + + return up; +} + + +/* + * Scan for any 8-bit characters. Return 1 if they exist. + * + * Scan up until the given endpoint (but not the actual endpoint itself). + * If the endpoint is NULL, scan until a '\0' is reached. + */ + +int +contains8bit(const char *start, const char *end) +{ + if (! start) + return 0; + + while (*start != '\0' && (!end || (start < end))) + if (! isascii((unsigned char) *start++)) + return 1; + + return 0; +} + + +/* + * See if input has any 8-bit bytes. + */ +int +scan_input (int fd, int *eightbit) { + int state; + char buf[BUFSIZ]; + + *eightbit = 0; + lseek (fd, (off_t) 0, SEEK_SET); + + while ((state = read (fd, buf, sizeof buf)) > 0) { + if (contains8bit (buf, buf + state)) { + *eightbit = 1; + return OK; + } + } + + return state == NOTOK ? NOTOK : OK; +}