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Diffstat (limited to 'common/msg.c')
| -rw-r--r-- | common/msg.c | 895 |
1 files changed, 895 insertions, 0 deletions
diff --git a/common/msg.c b/common/msg.c new file mode 100644 index 000000000000..2b18082c7ab8 --- /dev/null +++ b/common/msg.c @@ -0,0 +1,895 @@ +/*- + * Copyright (c) 1991, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1991, 1993, 1994, 1995, 1996 + * Keith Bostic. All rights reserved. + * + * See the LICENSE file for redistribution information. + */ + +#include "config.h" + +#ifndef lint +static const char sccsid[] = "@(#)msg.c 10.48 (Berkeley) 9/15/96"; +#endif /* not lint */ + +#include <sys/param.h> +#include <sys/types.h> /* XXX: param.h may not have included types.h */ +#include <sys/queue.h> +#include <sys/stat.h> +#include <sys/time.h> + +#include <bitstring.h> +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#ifdef __STDC__ +#include <stdarg.h> +#else +#include <varargs.h> +#endif + +#include "common.h" +#include "../vi/vi.h" + +/* + * msgq -- + * Display a message. + * + * PUBLIC: void msgq __P((SCR *, mtype_t, const char *, ...)); + */ +void +#ifdef __STDC__ +msgq(SCR *sp, mtype_t mt, const char *fmt, ...) +#else +msgq(sp, mt, fmt, va_alist) + SCR *sp; + mtype_t mt; + const char *fmt; + va_dcl +#endif +{ +#ifndef NL_ARGMAX +#define __NL_ARGMAX 20 /* Set to 9 by System V. */ + struct { + const char *str; /* String pointer. */ + size_t arg; /* Argument number. */ + size_t prefix; /* Prefix string length. */ + size_t skip; /* Skipped string length. */ + size_t suffix; /* Suffix string length. */ + } str[__NL_ARGMAX]; +#endif + static int reenter; /* STATIC: Re-entrancy check. */ + CHAR_T ch; + GS *gp; + size_t blen, cnt1, cnt2, len, mlen, nlen, soff; + const char *p, *t, *u; + char *bp, *mp, *rbp, *s_rbp; + va_list ap; + + /* + * !!! + * It's possible to enter msg when there's no screen to hold the + * message. If sp is NULL, ignore the special cases and put the + * message out to stderr. + */ + if (sp == NULL) { + gp = NULL; + if (mt == M_BERR) + mt = M_ERR; + else if (mt == M_VINFO) + mt = M_INFO; + } else { + gp = sp->gp; + switch (mt) { + case M_BERR: + if (F_ISSET(sp, SC_VI) && !O_ISSET(sp, O_VERBOSE)) { + F_SET(gp, G_BELLSCHED); + return; + } + mt = M_ERR; + break; + case M_VINFO: + if (!O_ISSET(sp, O_VERBOSE)) + return; + mt = M_INFO; + /* FALLTHROUGH */ + case M_INFO: + if (F_ISSET(sp, SC_EX_SILENT)) + return; + break; + case M_ERR: + case M_SYSERR: + break; + default: + abort(); + } + } + + /* + * It's possible to reenter msg when it allocates space. We're + * probably dead anyway, but there's no reason to drop core. + * + * XXX + * Yes, there's a race, but it should only be two instructions. + */ + if (reenter++) + return; + + /* Get space for the message. */ + nlen = 1024; + if (0) { +retry: FREE_SPACE(sp, bp, blen); + nlen *= 2; + } + bp = NULL; + blen = 0; + GET_SPACE_GOTO(sp, bp, blen, nlen); + + /* + * Error prefix. + * + * mp: pointer to the current next character to be written + * mlen: length of the already written characters + * blen: total length of the buffer + */ +#define REM (blen - mlen) + mp = bp; + mlen = 0; + if (mt == M_SYSERR) { + p = msg_cat(sp, "020|Error: ", &len); + if (REM < len) + goto retry; + memcpy(mp, p, len); + mp += len; + mlen += len; + } + + /* + * If we're running an ex command that the user didn't enter, display + * the file name and line number prefix. + */ + if ((mt == M_ERR || mt == M_SYSERR) && + sp != NULL && gp != NULL && gp->if_name != NULL) { + for (p = gp->if_name; *p != '\0'; ++p) { + len = snprintf(mp, REM, "%s", KEY_NAME(sp, *p)); + mp += len; + if ((mlen += len) > blen) + goto retry; + } + len = snprintf(mp, REM, ", %d: ", gp->if_lno); + mp += len; + if ((mlen += len) > blen) + goto retry; + } + + /* If nothing to format, we're done. */ + if (fmt == NULL) + goto nofmt; + fmt = msg_cat(sp, fmt, NULL); + +#ifndef NL_ARGMAX + /* + * Nvi should run on machines that don't support the numbered argument + * specifications (%[digit]*$). We do this by reformatting the string + * so that we can hand it to vsprintf(3) and it will use the arguments + * in the right order. When vsprintf returns, we put the string back + * into the right order. It's undefined, according to SVID III, to mix + * numbered argument specifications with the standard style arguments, + * so this should be safe. + * + * In addition, we also need a character that is known to not occur in + * any vi message, for separating the parts of the string. As callers + * of msgq are responsible for making sure that all the non-printable + * characters are formatted for printing before calling msgq, we use a + * random non-printable character selected at terminal initialization + * time. This code isn't fast by any means, but as messages should be + * relatively short and normally have only a few arguments, it won't be + * too bad. Regardless, nobody has come up with any other solution. + * + * The result of this loop is an array of pointers into the message + * string, with associated lengths and argument numbers. The array + * is in the "correct" order, and the arg field contains the argument + * order. + */ + for (p = fmt, soff = 0; soff < __NL_ARGMAX;) { + for (t = p; *p != '\0' && *p != '%'; ++p); + if (*p == '\0') + break; + ++p; + if (!isdigit(*p)) { + if (*p == '%') + ++p; + continue; + } + for (u = p; *++p != '\0' && isdigit(*p);); + if (*p != '$') + continue; + + /* Up to, and including the % character. */ + str[soff].str = t; + str[soff].prefix = u - t; + + /* Up to, and including the $ character. */ + str[soff].arg = atoi(u); + str[soff].skip = (p - u) + 1; + if (str[soff].arg >= __NL_ARGMAX) + goto ret; + + /* Up to, and including the conversion character. */ + for (u = p; (ch = *++p) != '\0';) + if (isalpha(ch) && + strchr("diouxXfeEgGcspn", ch) != NULL) + break; + str[soff].suffix = p - u; + if (ch != '\0') + ++p; + ++soff; + } + + /* If no magic strings, we're done. */ + if (soff == 0) + goto format; + + /* Get space for the reordered strings. */ + if ((rbp = malloc(nlen)) == NULL) + goto ret; + s_rbp = rbp; + + /* + * Reorder the strings into the message string based on argument + * order. + * + * !!! + * We ignore arguments that are out of order, i.e. if we don't find + * an argument, we continue. Assume (almost certainly incorrectly) + * that whoever created the string knew what they were doing. + * + * !!! + * Brute force "sort", but since we don't expect more than one or two + * arguments in a string, the setup cost of a fast sort will be more + * expensive than the loop. + */ + for (cnt1 = 1; cnt1 <= soff; ++cnt1) + for (cnt2 = 0; cnt2 < soff; ++cnt2) + if (cnt1 == str[cnt2].arg) { + memmove(s_rbp, str[cnt2].str, str[cnt2].prefix); + memmove(s_rbp + str[cnt2].prefix, + str[cnt2].str + str[cnt2].prefix + + str[cnt2].skip, str[cnt2].suffix); + s_rbp += str[cnt2].prefix + str[cnt2].suffix; + *s_rbp++ = + gp == NULL ? DEFAULT_NOPRINT : gp->noprint; + break; + } + *s_rbp = '\0'; + fmt = rbp; +#endif + +format: /* Format the arguments into the string. */ +#ifdef __STDC__ + va_start(ap, fmt); +#else + va_start(ap); +#endif + len = vsnprintf(mp, REM, fmt, ap); + va_end(ap); + if (len >= nlen) + goto retry; + +#ifndef NL_ARGMAX + if (soff == 0) + goto nofmt; + + /* + * Go through the resulting string, and, for each separator character + * separated string, enter its new starting position and length in the + * array. + */ + for (p = t = mp, cnt1 = 1, + ch = gp == NULL ? DEFAULT_NOPRINT : gp->noprint; *p != '\0'; ++p) + if (*p == ch) { + for (cnt2 = 0; cnt2 < soff; ++cnt2) + if (str[cnt2].arg == cnt1) + break; + str[cnt2].str = t; + str[cnt2].prefix = p - t; + t = p + 1; + ++cnt1; + } + + /* + * Reorder the strings once again, putting them back into the + * message buffer. + * + * !!! + * Note, the length of the message gets decremented once for + * each substring, when we discard the separator character. + */ + for (s_rbp = rbp, cnt1 = 0; cnt1 < soff; ++cnt1) { + memmove(rbp, str[cnt1].str, str[cnt1].prefix); + rbp += str[cnt1].prefix; + --len; + } + memmove(mp, s_rbp, rbp - s_rbp); + + /* Free the reordered string memory. */ + free(s_rbp); +#endif + +nofmt: mp += len; + if ((mlen += len) > blen) + goto retry; + if (mt == M_SYSERR) { + len = snprintf(mp, REM, ": %s", strerror(errno)); + mp += len; + if ((mlen += len) > blen) + goto retry; + mt = M_ERR; + } + + /* Add trailing newline. */ + if ((mlen += 1) > blen) + goto retry; + *mp = '\n'; + + if (sp != NULL) + (void)ex_fflush(sp); + if (gp != NULL) + gp->scr_msg(sp, mt, bp, mlen); + else + (void)fprintf(stderr, "%.*s", (int)mlen, bp); + + /* Cleanup. */ +ret: FREE_SPACE(sp, bp, blen); +alloc_err: + reenter = 0; +} + +/* + * msgq_str -- + * Display a message with an embedded string. + * + * PUBLIC: void msgq_str __P((SCR *, mtype_t, char *, char *)); + */ +void +msgq_str(sp, mtype, str, fmt) + SCR *sp; + mtype_t mtype; + char *str, *fmt; +{ + int nf, sv_errno; + char *p; + + if (str == NULL) { + msgq(sp, mtype, fmt); + return; + } + + sv_errno = errno; + p = msg_print(sp, str, &nf); + errno = sv_errno; + msgq(sp, mtype, fmt, p); + if (nf) + FREE_SPACE(sp, p, 0); +} + +/* + * mod_rpt -- + * Report on the lines that changed. + * + * !!! + * Historic vi documentation (USD:15-8) claimed that "The editor will also + * always tell you when a change you make affects text which you cannot see." + * This wasn't true -- edit a large file and do "100d|1". We don't implement + * this semantic since it requires tracking each line that changes during a + * command instead of just keeping count. + * + * Line counts weren't right in historic vi, either. For example, given the + * file: + * abc + * def + * the command 2d}, from the 'b' would report that two lines were deleted, + * not one. + * + * PUBLIC: void mod_rpt __P((SCR *)); + */ +void +mod_rpt(sp) + SCR *sp; +{ + static char * const action[] = { + "293|added", + "294|changed", + "295|deleted", + "296|joined", + "297|moved", + "298|shifted", + "299|yanked", + }; + static char * const lines[] = { + "300|line", + "301|lines", + }; + recno_t total; + u_long rptval; + int first, cnt; + size_t blen, len, tlen; + const char *t; + char * const *ap; + char *bp, *p; + + /* Change reports are turned off in batch mode. */ + if (F_ISSET(sp, SC_EX_SILENT)) + return; + + /* Reset changing line number. */ + sp->rptlchange = OOBLNO; + + /* + * Don't build a message if not enough changed. + * + * !!! + * And now, a vi clone test. Historically, vi reported if the number + * of changed lines was > than the value, not >=, unless it was a yank + * command, which used >=. No lie. Furthermore, an action was never + * reported for a single line action. This is consistent for actions + * other than yank, but yank didn't report single line actions even if + * the report edit option was set to 1. In addition, setting report to + * 0 in the 4BSD historic vi was equivalent to setting it to 1, for an + * unknown reason (this bug was fixed in System III/V at some point). + * I got complaints, so nvi conforms to System III/V historic practice + * except that we report a yank of 1 line if report is set to 1. + */ +#define ARSIZE(a) sizeof(a) / sizeof (*a) +#define MAXNUM 25 + rptval = O_VAL(sp, O_REPORT); + for (cnt = 0, total = 0; cnt < ARSIZE(action); ++cnt) + total += sp->rptlines[cnt]; + if (total == 0) + return; + if (total <= rptval && sp->rptlines[L_YANKED] < rptval) { + for (cnt = 0; cnt < ARSIZE(action); ++cnt) + sp->rptlines[cnt] = 0; + return; + } + + /* Build and display the message. */ + GET_SPACE_GOTO(sp, bp, blen, sizeof(action) * MAXNUM + 1); + for (p = bp, first = 1, tlen = 0, + ap = action, cnt = 0; cnt < ARSIZE(action); ++ap, ++cnt) + if (sp->rptlines[cnt] != 0) { + if (first) + first = 0; + else { + *p++ = ';'; + *p++ = ' '; + tlen += 2; + } + len = snprintf(p, MAXNUM, "%lu ", sp->rptlines[cnt]); + p += len; + tlen += len; + t = msg_cat(sp, + lines[sp->rptlines[cnt] == 1 ? 0 : 1], &len); + memcpy(p, t, len); + p += len; + tlen += len; + *p++ = ' '; + ++tlen; + t = msg_cat(sp, *ap, &len); + memcpy(p, t, len); + p += len; + tlen += len; + sp->rptlines[cnt] = 0; + } + + /* Add trailing newline. */ + *p = '\n'; + ++tlen; + + (void)ex_fflush(sp); + sp->gp->scr_msg(sp, M_INFO, bp, tlen); + + FREE_SPACE(sp, bp, blen); +alloc_err: + return; + +#undef ARSIZE +#undef MAXNUM +} + +/* + * msgq_status -- + * Report on the file's status. + * + * PUBLIC: void msgq_status __P((SCR *, recno_t, u_int)); + */ +void +msgq_status(sp, lno, flags) + SCR *sp; + recno_t lno; + u_int flags; +{ + static int poisoned; + recno_t last; + size_t blen, len; + int cnt, needsep; + const char *t; + char **ap, *bp, *np, *p, *s; + + /* Get sufficient memory. */ + len = strlen(sp->frp->name); + GET_SPACE_GOTO(sp, bp, blen, len * MAX_CHARACTER_COLUMNS + 128); + p = bp; + + /* Copy in the filename. */ + for (p = bp, t = sp->frp->name; *t != '\0'; ++t) { + len = KEY_LEN(sp, *t); + memcpy(p, KEY_NAME(sp, *t), len); + p += len; + } + np = p; + *p++ = ':'; + *p++ = ' '; + + /* Copy in the argument count. */ + if (F_ISSET(sp, SC_STATUS_CNT) && sp->argv != NULL) { + for (cnt = 0, ap = sp->argv; *ap != NULL; ++ap, ++cnt); + if (cnt > 1) { + (void)sprintf(p, + msg_cat(sp, "317|%d files to edit", NULL), cnt); + p += strlen(p); + *p++ = ':'; + *p++ = ' '; + } + F_CLR(sp, SC_STATUS_CNT); + } + + /* + * See nvi/exf.c:file_init() for a description of how and when the + * read-only bit is set. + * + * !!! + * The historic display for "name changed" was "[Not edited]". + */ + needsep = 0; + if (F_ISSET(sp->frp, FR_NEWFILE)) { + F_CLR(sp->frp, FR_NEWFILE); + t = msg_cat(sp, "021|new file", &len); + memcpy(p, t, len); + p += len; + needsep = 1; + } else { + if (F_ISSET(sp->frp, FR_NAMECHANGE)) { + t = msg_cat(sp, "022|name changed", &len); + memcpy(p, t, len); + p += len; + needsep = 1; + } + if (needsep) { + *p++ = ','; + *p++ = ' '; + } + if (F_ISSET(sp->ep, F_MODIFIED)) + t = msg_cat(sp, "023|modified", &len); + else + t = msg_cat(sp, "024|unmodified", &len); + memcpy(p, t, len); + p += len; + needsep = 1; + } + if (F_ISSET(sp->frp, FR_UNLOCKED)) { + if (needsep) { + *p++ = ','; + *p++ = ' '; + } + t = msg_cat(sp, "025|UNLOCKED", &len); + memcpy(p, t, len); + p += len; + needsep = 1; + } + if (O_ISSET(sp, O_READONLY)) { + if (needsep) { + *p++ = ','; + *p++ = ' '; + } + t = msg_cat(sp, "026|readonly", &len); + memcpy(p, t, len); + p += len; + needsep = 1; + } + if (needsep) { + *p++ = ':'; + *p++ = ' '; + } + if (LF_ISSET(MSTAT_SHOWLAST)) { + if (db_last(sp, &last)) + return; + if (last == 0) { + t = msg_cat(sp, "028|empty file", &len); + memcpy(p, t, len); + p += len; + } else { + t = msg_cat(sp, "027|line %lu of %lu [%ld%%]", &len); + (void)sprintf(p, t, lno, last, (lno * 100) / last); + p += strlen(p); + } + } else { + t = msg_cat(sp, "029|line %lu", &len); + (void)sprintf(p, t, lno); + p += strlen(p); + } +#ifdef DEBUG + (void)sprintf(p, " (pid %lu)", (u_long)getpid()); + p += strlen(p); +#endif + *p++ = '\n'; + len = p - bp; + + /* + * There's a nasty problem with long path names. Cscope and tags files + * can result in long paths and vi will request a continuation key from + * the user as soon as it starts the screen. Unfortunately, the user + * has already typed ahead, and chaos results. If we assume that the + * characters in the filenames and informational messages only take a + * single screen column each, we can trim the filename. + * + * XXX + * Status lines get put up at fairly awkward times. For example, when + * you do a filter read (e.g., :read ! echo foo) in the top screen of a + * split screen, we have to repaint the status lines for all the screens + * below the top screen. We don't want users having to enter continue + * characters for those screens. Make it really hard to screw this up. + */ + s = bp; + if (LF_ISSET(MSTAT_TRUNCATE) && len > sp->cols) { + for (; s < np && (*s != '/' || (p - s) > sp->cols - 3); ++s); + if (s == np) { + s = p - (sp->cols - 5); + *--s = ' '; + } + *--s = '.'; + *--s = '.'; + *--s = '.'; + len = p - s; + } + + /* Flush any waiting ex messages. */ + (void)ex_fflush(sp); + + sp->gp->scr_msg(sp, M_INFO, s, len); + + FREE_SPACE(sp, bp, blen); +alloc_err: + return; +} + +/* + * msg_open -- + * Open the message catalogs. + * + * PUBLIC: int msg_open __P((SCR *, char *)); + */ +int +msg_open(sp, file) + SCR *sp; + char *file; +{ + /* + * !!! + * Assume that the first file opened is the system default, and that + * all subsequent ones user defined. Only display error messages + * if we can't open the user defined ones -- it's useful to know if + * the system one wasn't there, but if nvi is being shipped with an + * installed system, the file will be there, if it's not, then the + * message will be repeated every time nvi is started up. + */ + static int first = 1; + DB *db; + DBT data, key; + recno_t msgno; + char *p, *t, buf[MAXPATHLEN]; + + if ((p = strrchr(file, '/')) != NULL && p[1] == '\0' && + ((t = getenv("LC_MESSAGES")) != NULL && t[0] != '\0' || + (t = getenv("LANG")) != NULL && t[0] != '\0')) { + (void)snprintf(buf, sizeof(buf), "%s%s", file, t); + p = buf; + } else + p = file; + if ((db = dbopen(p, + O_NONBLOCK | O_RDONLY, 0, DB_RECNO, NULL)) == NULL) { + if (first) { + first = 0; + return (1); + } + msgq_str(sp, M_SYSERR, p, "%s"); + return (1); + } + + /* + * Test record 1 for the magic string. The msgq call is here so + * the message catalog build finds it. + */ +#define VMC "VI_MESSAGE_CATALOG" + key.data = &msgno; + key.size = sizeof(recno_t); + msgno = 1; + if (db->get(db, &key, &data, 0) != 0 || + data.size != sizeof(VMC) - 1 || + memcmp(data.data, VMC, sizeof(VMC) - 1)) { + (void)db->close(db); + if (first) { + first = 0; + return (1); + } + msgq_str(sp, M_ERR, p, + "030|The file %s is not a message catalog"); + return (1); + } + first = 0; + + if (sp->gp->msg != NULL) + (void)sp->gp->msg->close(sp->gp->msg); + sp->gp->msg = db; + return (0); +} + +/* + * msg_close -- + * Close the message catalogs. + * + * PUBLIC: void msg_close __P((GS *)); + */ +void +msg_close(gp) + GS *gp; +{ + if (gp->msg != NULL) + (void)gp->msg->close(gp->msg); +} + +/* + * msg_cont -- + * Return common continuation messages. + * + * PUBLIC: const char *msg_cmsg __P((SCR *, cmsg_t, size_t *)); + */ +const char * +msg_cmsg(sp, which, lenp) + SCR *sp; + cmsg_t which; + size_t *lenp; +{ + switch (which) { + case CMSG_CONF: + return (msg_cat(sp, "268|confirm? [ynq]", lenp)); + case CMSG_CONT: + return (msg_cat(sp, "269|Press any key to continue: ", lenp)); + case CMSG_CONT_EX: + return (msg_cat(sp, + "270|Press any key to continue [: to enter more ex commands]: ", + lenp)); + case CMSG_CONT_R: + return (msg_cat(sp, "161|Press Enter to continue: ", lenp)); + case CMSG_CONT_S: + return (msg_cat(sp, "275| cont?", lenp)); + case CMSG_CONT_Q: + return (msg_cat(sp, + "271|Press any key to continue [q to quit]: ", lenp)); + default: + abort(); + } + /* NOTREACHED */ +} + +/* + * msg_cat -- + * Return a single message from the catalog, plus its length. + * + * !!! + * Only a single catalog message can be accessed at a time, if multiple + * ones are needed, they must be copied into local memory. + * + * PUBLIC: const char *msg_cat __P((SCR *, const char *, size_t *)); + */ +const char * +msg_cat(sp, str, lenp) + SCR *sp; + const char *str; + size_t *lenp; +{ + GS *gp; + DBT data, key; + recno_t msgno; + + /* + * If it's not a catalog message, i.e. has doesn't have a leading + * number and '|' symbol, we're done. + */ + if (isdigit(str[0]) && + isdigit(str[1]) && isdigit(str[2]) && str[3] == '|') { + key.data = &msgno; + key.size = sizeof(recno_t); + msgno = atoi(str); + + /* + * XXX + * Really sleazy hack -- we put an extra character on the + * end of the format string, and then we change it to be + * the nul termination of the string. There ought to be + * a better way. Once we can allocate multiple temporary + * memory buffers, maybe we can use one of them instead. + */ + gp = sp == NULL ? NULL : sp->gp; + if (gp != NULL && gp->msg != NULL && + gp->msg->get(gp->msg, &key, &data, 0) == 0 && + data.size != 0) { + if (lenp != NULL) + *lenp = data.size - 1; + ((char *)data.data)[data.size - 1] = '\0'; + return (data.data); + } + str = &str[4]; + } + if (lenp != NULL) + *lenp = strlen(str); + return (str); +} + +/* + * msg_print -- + * Return a printable version of a string, in allocated memory. + * + * PUBLIC: char *msg_print __P((SCR *, const char *, int *)); + */ +char * +msg_print(sp, s, needfree) + SCR *sp; + const char *s; + int *needfree; +{ + size_t blen, nlen; + const char *cp; + char *bp, *ep, *p, *t; + + *needfree = 0; + + for (cp = s; *cp != '\0'; ++cp) + if (!isprint(*cp)) + break; + if (*cp == '\0') + return ((char *)s); /* SAFE: needfree set to 0. */ + + nlen = 0; + if (0) { +retry: if (sp == NULL) + free(bp); + else + FREE_SPACE(sp, bp, blen); + needfree = 0; + } + nlen += 256; + if (sp == NULL) { + if ((bp = malloc(nlen)) == NULL) + goto alloc_err; + } else + GET_SPACE_GOTO(sp, bp, blen, nlen); + if (0) { +alloc_err: return (""); + } + *needfree = 1; + + for (p = bp, ep = (bp + blen) - 1, cp = s; *cp != '\0' && p < ep; ++cp) + for (t = KEY_NAME(sp, *cp); *t != '\0' && p < ep; *p++ = *t++); + if (p == ep) + goto retry; + *p = '\0'; + return (bp); +} |