-
-/*
- * utils.c -- various utility routines
+/* utils.c -- various utility routines
*
* This code is Copyright (c) 2006, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
#include <h/mh.h>
#include <h/utils.h>
+#include <h/signals.h>
+#include "m_mktemp.h"
+#include "makedir.h"
#include <fcntl.h>
-
-/* sbr/signals.c */
-extern int setup_signal_handlers();
-
-/* sbr/m_mktemp.c */
-extern void remove_registered_files_atexit();
+#include <limits.h>
extern char *mhdocdir;
+/* plurals gives the letter ess to indicate a plural noun, or an empty
+ * string as plurals+1 for the singular noun. Used by the PLURALS
+ * macro. */
+const char plurals[] = "s";
+
/*
* We allocate space for messages (msgs array)
* this number of elements at a time.
*/
#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) {
+ mh_xfree(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. */
- memory = realloc(ptr, size);
- if (!memory)
- adios(NULL, "Realloc failed");
+ p = calloc(nelem, elsize);
+ if (!p)
+ adios(NULL, "calloc failed, size wanted: %zu * %zu", nelem, elsize);
- return memory;
+ return p;
}
-/*
- * Safely call calloc
- */
-void *
-mh_xcalloc(size_t nmemb, size_t size)
+/* Duplicate a NUL-terminated string, exit on failure. */
+char *mh_xstrdup(const char *src)
{
- void *memory;
+ size_t n;
+ char *dest;
- if (nmemb == 0 || size == 0)
- adios(NULL, "Tried to calloc 0 bytes");
+ n = strlen(src) + 1; /* Ignore possibility of overflow. */
+ dest = mh_xmalloc(n);
+ memcpy(dest, src, n);
- if ((memory = calloc(nmemb, size))) {
- return memory;
- } else {
- adios(NULL, "calloc failed");
- }
+ 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. */
}
/*
char *
pwd(void)
{
- register char *cp;
+ char *cp;
static char curwd[PATH_MAX];
if (!getcwd (curwd, PATH_MAX)) {
- admonish (NULL, "unable to determine working directory");
+ inform("unable to determine working directory, continuing...");
if (!mypath || !*mypath
|| (strcpy (curwd, mypath), chdir (curwd)) == -1) {
strcpy (curwd, "/");
int folder_exists(const char *folder)
{
struct stat st;
- int exists = 0;
- if (stat (folder, &st) == -1) {
- /* The folder either doesn't exist, or we hit an error. Either way
- * return a failure.
- */
- exists = 0;
- } else {
- /* We can see a folder with the right name */
- exists = 1;
- }
-
- return exists;
+ return stat(folder, &st) != -1;
}
-
/*
* create_folder
* Check to see if a folder exists, if not, prompt the user to create
msgs->msgnums[msgs->size++] = msgnum;
}
-/* Open a form or components file */
-int
-open_form(char **form, char *def)
-{
- int in;
- if (*form) {
- if ((in = open (etcpath (*form), O_RDONLY)) == NOTOK)
- adios (*form, "unable to open form file");
- } else {
- if ((in = open (etcpath (def), O_RDONLY)) == NOTOK)
- adios (def, "unable to open default components file");
- *form = def;
- }
- return in;
-}
-
/*
* Finds first occurrence of str in buf. buf is not a C string but a
}
+/* truncpy copies at most size - 1 chars from non-NULL src to non-NULL,
+ * non-overlapping, dst, and ensures dst is NUL terminated. If size is
+ * zero then it aborts as dst cannot be NUL terminated.
+ *
+ * It's to be used when truncation is intended and correct, e.g.
+ * reporting a possibly very long external string back to the user. One
+ * of its advantages over strncpy(3) is it doesn't pad in the common
+ * case of no truncation. */
+void trunccpy(char *dst, const char *src, size_t size)
+{
+ if (!size) {
+ inform("trunccpy: zero-length destination: \"%.20s\"",
+ src ? src : "null");
+ abort();
+ }
+
+ if (strnlen(src, size) < size) {
+ strcpy(dst, src);
+ } else {
+ memcpy(dst, src, size - 1);
+ dst[size - 1] = '\0';
+ }
+}
+
+
+/* has_prefix returns true if non-NULL s starts with non-NULL prefix. */
+bool has_prefix(const char *s, const char *prefix)
+{
+ while (*s && *s == *prefix) {
+ s++;
+ prefix++;
+ }
+
+ return *prefix == '\0';
+}
+
+
+/* has_suffix returns true if non-NULL s ends with non-NULL suffix. */
+bool has_suffix(const char *s, const char *suffix)
+{
+ size_t ls, lsuf;
+
+ ls = strlen(s);
+ lsuf = strlen(suffix);
+
+ return lsuf <= ls && !strcmp(s + ls - lsuf, suffix);
+}
+
+
+/* has_suffix_c returns true if non-NULL string s ends with a c before the
+ * terminating NUL. */
+bool has_suffix_c(const char *s, int c)
+{
+ return *s && s[strlen(s) - 1] == c;
+}
+
+
+/* trim_suffix_c 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 trim_suffix_c(char *s, int c)
+{
+ if (!*s)
+ return;
+
+ s += strlen(s) - 1;
+ if (*s == c)
+ *s = '\0';
+}
+
+
+/* to_lower runs all of s through tolower(3). */
+void to_lower(char *s)
+{
+ unsigned char *b;
+
+ for (b = (unsigned char *)s; (*b = tolower(*b)); b++)
+ ;
+}
+
+
+/* to_upper runs all of s through toupper(3). */
+void to_upper(char *s)
+{
+ unsigned char *b;
+
+ for (b = (unsigned char *)s; (*b = toupper(*b)); b++)
+ ;
+}
+
+
int
nmh_init(const char *argv0, int read_context) {
- if (! setlocale(LC_ALL, "")) {
- admonish(NULL, "setlocale failed, check your LC_ALL, LC_CTYPE, and "
- "LANG environment variables");
- }
+ int status = OK;
+ char *locale;
invo_name = r1bindex ((char *) argv0, '/');
}
/* 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
+ specified) version of nmh than they had run before, 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");
+ "=====================\n");
printf ("Welcome to nmh version %s\n\n", VERSION);
- printf ("See the release notes in %s/NEWS .\n\n",
+ 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");
+ "=====================\n\n");
fputs ("Press enter to continue: ", stdout);
(void) read_line ();
putchar ('\n');
}
}
-
- return OK;
} else {
- int status = context_foil(NULL);
- if (status != OK) {
- advise("", "failed to create minimal profile/conext");
+ if ((status = context_foil(NULL)) != OK) {
+ advise("", "failed to create minimal profile/context");
}
- return status;
}
+
+ /* 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)) {
+ inform("setlocale failed, check your LC_ALL, LC_CTYPE, and LANG "
+ "environment variables, continuing...");
+ }
+
+ return status;
}
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 = strtod (VERSION, NULL);
+ const float current_version = strtof (VERSION, NULL);
const float old_version =
- context_version && strncmp (context_version, "nmh-", 4) == 0
+ context_version && has_prefix(context_version, "nmh-")
? strtof (context_version + 4, NULL)
: 99999999;
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;
- }
+ return old_version < current_version;
}
-}
-
-/* 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); }
+ if (context_version == NULL || strcmp(context_version, "nmh-" VERSION) != 0) {
+ context_replace ("Version", "nmh-" VERSION);
+ return 1;
+ }
- return up;
+ return 0;
}
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, 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;
+}
+
+
+/*
+ * Convert an int to a char string.
+ */
+char *
+m_str(int value) {
+ return m_strn(value, 0);
+}
+
+
+/*
+ * Convert an int to a char string, of limited width if > 0.
+ */
+#define STR(s) #s
+/* SIZE(n) includes NUL. n must just be digits, not an equation. */
+#define SIZE(n) (sizeof STR(n))
+
+char *
+m_strn(int value, unsigned int width) {
+ /* Need to include space for negative sign. But don't use INT_MIN
+ because it could be a macro that would fool SIZE(n). */
+ static char buffer[SIZE(-INT_MAX)];
+ const int num_chars = snprintf(buffer, sizeof buffer, "%d", value);
+
+ return num_chars > 0 && (width == 0 || (unsigned int) num_chars <= width)
+ ? buffer
+ : "?";
+}
projects / nmh / blobdiff