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Diffstat (limited to 'test/monniaux/glpk-4.65/src/env/stream.c')
| -rw-r--r-- | test/monniaux/glpk-4.65/src/env/stream.c | 517 |
1 files changed, 517 insertions, 0 deletions
diff --git a/test/monniaux/glpk-4.65/src/env/stream.c b/test/monniaux/glpk-4.65/src/env/stream.c new file mode 100644 index 00000000..906e5b04 --- /dev/null +++ b/test/monniaux/glpk-4.65/src/env/stream.c @@ -0,0 +1,517 @@ +/* stream.c (stream input/output) */ + +/*********************************************************************** +* This code is part of GLPK (GNU Linear Programming Kit). +* +* Copyright (C) 2008-2017 Andrew Makhorin, Department for Applied +* Informatics, Moscow Aviation Institute, Moscow, Russia. All rights +* reserved. E-mail: <mao@gnu.org>. +* +* GLPK is free software: you can redistribute it and/or modify it +* under the terms of the GNU General Public License as published by +* the Free Software Foundation, either version 3 of the License, or +* (at your option) any later version. +* +* GLPK is distributed in the hope that it will be useful, but WITHOUT +* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public +* License for more details. +* +* You should have received a copy of the GNU General Public License +* along with GLPK. If not, see <http://www.gnu.org/licenses/>. +***********************************************************************/ + +#include "env.h" +#include "zlib.h" + +struct glp_file +{ /* sequential stream descriptor */ + char *base; + /* pointer to buffer */ + int size; + /* size of buffer, in bytes */ + char *ptr; + /* pointer to next byte in buffer */ + int cnt; + /* count of bytes in buffer */ + int flag; + /* stream flags: */ +#define IONULL 0x01 /* null file */ +#define IOSTD 0x02 /* standard stream */ +#define IOGZIP 0x04 /* gzipped file */ +#define IOWRT 0x08 /* output stream */ +#define IOEOF 0x10 /* end of file */ +#define IOERR 0x20 /* input/output error */ + void *file; + /* pointer to underlying control object */ +}; + +/*********************************************************************** +* NAME +* +* glp_open - open stream +* +* SYNOPSIS +* +* glp_file *glp_open(const char *name, const char *mode); +* +* DESCRIPTION +* +* The routine glp_open opens a file whose name is a string pointed to +* by name and associates a stream with it. +* +* The following special filenames are recognized by the routine (this +* feature is platform independent): +* +* "/dev/null" empty (null) file; +* "/dev/stdin" standard input stream; +* "/dev/stdout" standard output stream; +* "/dev/stderr" standard error stream. +* +* If the specified filename is ended with ".gz", it is assumed that +* the file is in gzipped format. In this case the file is compressed +* or decompressed by the I/O routines "on the fly". +* +* The parameter mode points to a string, which indicates the open mode +* and should be one of the following: +* +* "r" open text file for reading; +* "w" truncate to zero length or create text file for writing; +* "a" append, open or create text file for writing at end-of-file; +* "rb" open binary file for reading; +* "wb" truncate to zero length or create binary file for writing; +* "ab" append, open or create binary file for writing at end-of-file. +* +* RETURNS +* +* The routine glp_open returns a pointer to the object controlling the +* stream. If the operation fails, the routine returns NULL. */ + +glp_file *glp_open(const char *name, const char *mode) +{ glp_file *f; + int flag; + void *file; + if (strcmp(mode, "r") == 0 || strcmp(mode, "rb") == 0) + flag = 0; + else if (strcmp(mode, "w") == 0 || strcmp(mode, "wb") == 0) + flag = IOWRT; +#if 1 /* 08/V-2014 */ + else if (strcmp(mode, "a") == 0 || strcmp(mode, "ab") == 0) + flag = IOWRT; +#endif + else + xerror("glp_open: invalid mode string\n"); + if (strcmp(name, "/dev/null") == 0) + { flag |= IONULL; + file = NULL; + } + else if (strcmp(name, "/dev/stdin") == 0) + { flag |= IOSTD; + file = stdin; + } + else if (strcmp(name, "/dev/stdout") == 0) + { flag |= IOSTD; + file = stdout; + } + else if (strcmp(name, "/dev/stderr") == 0) + { flag |= IOSTD; + file = stderr; + } + else + { char *ext = strrchr(name, '.'); + if (ext == NULL || strcmp(ext, ".gz") != 0) + { file = fopen(name, mode); + if (file == NULL) +#if 0 /* 29/I-2017 */ + { put_err_msg(strerror(errno)); +#else + { put_err_msg(xstrerr(errno)); +#endif + return NULL; + } + } + else + { flag |= IOGZIP; + if (strcmp(mode, "r") == 0) + mode = "rb"; + else if (strcmp(mode, "w") == 0) + mode = "wb"; +#if 1 /* 08/V-2014; this mode seems not to work */ + else if (strcmp(mode, "a") == 0) + mode = "ab"; +#endif + file = gzopen(name, mode); + if (file == NULL) +#if 0 /* 29/I-2017 */ + { put_err_msg(strerror(errno)); +#else + { put_err_msg(xstrerr(errno)); +#endif + return NULL; + } + } + } + f = talloc(1, glp_file); + f->base = talloc(BUFSIZ, char); + f->size = BUFSIZ; + f->ptr = f->base; + f->cnt = 0; + f->flag = flag; + f->file = file; + return f; +} + +/*********************************************************************** +* NAME +* +* glp_eof - test end-of-file indicator +* +* SYNOPSIS +* +* int glp_eof(glp_file *f); +* +* DESCRIPTION +* +* The routine glp_eof tests the end-of-file indicator for the stream +* pointed to by f. +* +* RETURNS +* +* The routine glp_eof returns non-zero if and only if the end-of-file +* indicator is set for the specified stream. */ + +int glp_eof(glp_file *f) +{ return + f->flag & IOEOF; +} + +/*********************************************************************** +* NAME +* +* glp_ioerr - test I/O error indicator +* +* SYNOPSIS +* +* int glp_ioerr(glp_file *f); +* +* DESCRIPTION +* +* The routine glp_ioerr tests the I/O error indicator for the stream +* pointed to by f. +* +* RETURNS +* +* The routine glp_ioerr returns non-zero if and only if the I/O error +* indicator is set for the specified stream. */ + +int glp_ioerr(glp_file *f) +{ return + f->flag & IOERR; +} + +/*********************************************************************** +* NAME +* +* glp_read - read data from stream +* +* SYNOPSIS +* +* int glp_read(glp_file *f, void *buf, int nnn); +* +* DESCRIPTION +* +* The routine glp_read reads, into the buffer pointed to by buf, up to +* nnn bytes, from the stream pointed to by f. +* +* RETURNS +* +* The routine glp_read returns the number of bytes successfully read +* (which may be less than nnn). If an end-of-file is encountered, the +* end-of-file indicator for the stream is set and glp_read returns +* zero. If a read error occurs, the error indicator for the stream is +* set and glp_read returns a negative value. */ + +int glp_read(glp_file *f, void *buf, int nnn) +{ int nrd, cnt; + if (f->flag & IOWRT) + xerror("glp_read: attempt to read from output stream\n"); + if (nnn < 1) + xerror("glp_read: nnn = %d; invalid parameter\n", nnn); + for (nrd = 0; nrd < nnn; nrd += cnt) + { if (f->cnt == 0) + { /* buffer is empty; fill it */ + if (f->flag & IONULL) + cnt = 0; + else if (!(f->flag & IOGZIP)) + { cnt = fread(f->base, 1, f->size, (FILE *)(f->file)); + if (ferror((FILE *)(f->file))) + { f->flag |= IOERR; +#if 0 /* 29/I-2017 */ + put_err_msg(strerror(errno)); +#else + put_err_msg(xstrerr(errno)); +#endif + return EOF; + } + } + else + { int errnum; + const char *msg; + cnt = gzread((gzFile)(f->file), f->base, f->size); + if (cnt < 0) + { f->flag |= IOERR; + msg = gzerror((gzFile)(f->file), &errnum); + if (errnum == Z_ERRNO) +#if 0 /* 29/I-2017 */ + put_err_msg(strerror(errno)); +#else + put_err_msg(xstrerr(errno)); +#endif + else + put_err_msg(msg); + return EOF; + } + } + if (cnt == 0) + { if (nrd == 0) + f->flag |= IOEOF; + break; + } + f->ptr = f->base; + f->cnt = cnt; + } + cnt = nnn - nrd; + if (cnt > f->cnt) + cnt = f->cnt; + memcpy((char *)buf + nrd, f->ptr, cnt); + f->ptr += cnt; + f->cnt -= cnt; + } + return nrd; +} + +/*********************************************************************** +* NAME +* +* glp_getc - read character from stream +* +* SYNOPSIS +* +* int glp_getc(glp_file *f); +* +* DESCRIPTION +* +* The routine glp_getc obtains a next character as an unsigned char +* converted to an int from the input stream pointed to by f. +* +* RETURNS +* +* The routine glp_getc returns the next character obtained. However, +* if an end-of-file is encountered or a read error occurs, the routine +* returns EOF. (An end-of-file and a read error can be distinguished +* by use of the routines glp_eof and glp_ioerr.) */ + +int glp_getc(glp_file *f) +{ unsigned char buf[1]; + if (f->flag & IOWRT) + xerror("glp_getc: attempt to read from output stream\n"); + if (glp_read(f, buf, 1) != 1) + return EOF; + return buf[0]; +} + +/*********************************************************************** +* do_flush - flush output stream +* +* This routine causes buffered data for the specified output stream to +* be written to the associated file. +* +* If the operation was successful, the routine returns zero, otherwise +* non-zero. */ + +static int do_flush(glp_file *f) +{ xassert(f->flag & IOWRT); + if (f->cnt > 0) + { if (f->flag & IONULL) + ; + else if (!(f->flag & IOGZIP)) + { if ((int)fwrite(f->base, 1, f->cnt, (FILE *)(f->file)) + != f->cnt) + { f->flag |= IOERR; +#if 0 /* 29/I-2017 */ + put_err_msg(strerror(errno)); +#else + put_err_msg(xstrerr(errno)); +#endif + return EOF; + } + } + else + { int errnum; + const char *msg; + if (gzwrite((gzFile)(f->file), f->base, f->cnt) != f->cnt) + { f->flag |= IOERR; + msg = gzerror((gzFile)(f->file), &errnum); + if (errnum == Z_ERRNO) +#if 0 /* 29/I-2017 */ + put_err_msg(strerror(errno)); +#else + put_err_msg(xstrerr(errno)); +#endif + else + put_err_msg(msg); + return EOF; + } + } + } + f->ptr = f->base; + f->cnt = 0; + return 0; +} + +/*********************************************************************** +* NAME +* +* glp_write - write data to stream +* +* SYNOPSIS +* +* int glp_write(glp_file *f, const void *buf, int nnn); +* +* DESCRIPTION +* +* The routine glp_write writes, from the buffer pointed to by buf, up +* to nnn bytes, to the stream pointed to by f. +* +* RETURNS +* +* The routine glp_write returns the number of bytes successfully +* written (which is equal to nnn). If a write error occurs, the error +* indicator for the stream is set and glp_write returns a negative +* value. */ + +int glp_write(glp_file *f, const void *buf, int nnn) +{ int nwr, cnt; + if (!(f->flag & IOWRT)) + xerror("glp_write: attempt to write to input stream\n"); + if (nnn < 1) + xerror("glp_write: nnn = %d; invalid parameter\n", nnn); + for (nwr = 0; nwr < nnn; nwr += cnt) + { cnt = nnn - nwr; + if (cnt > f->size - f->cnt) + cnt = f->size - f->cnt; + memcpy(f->ptr, (const char *)buf + nwr, cnt); + f->ptr += cnt; + f->cnt += cnt; + if (f->cnt == f->size) + { /* buffer is full; flush it */ + if (do_flush(f) != 0) + return EOF; + } + } + return nwr; +} + +/*********************************************************************** +* NAME +* +* glp_format - write formatted data to stream +* +* SYNOPSIS +* +* int glp_format(glp_file *f, const char *fmt, ...); +* +* DESCRIPTION +* +* The routine glp_format writes formatted data to the stream pointed +* to by f. The format control string pointed to by fmt specifies how +* subsequent arguments are converted for output. +* +* RETURNS +* +* The routine glp_format returns the number of characters written, or +* a negative value if an output error occurs. */ + +int glp_format(glp_file *f, const char *fmt, ...) +{ ENV *env = get_env_ptr(); + va_list arg; + int nnn; + if (!(f->flag & IOWRT)) + xerror("glp_format: attempt to write to input stream\n"); + va_start(arg, fmt); + nnn = vsprintf(env->term_buf, fmt, arg); + xassert(0 <= nnn && nnn < TBUF_SIZE); + va_end(arg); + return nnn == 0 ? 0 : glp_write(f, env->term_buf, nnn); +} + +/*********************************************************************** +* NAME +* +* glp_close - close stream +* +* SYNOPSIS +* +* int glp_close(glp_file *f); +* +* DESCRIPTION +* +* The routine glp_close closes the stream pointed to by f. +* +* RETURNS +* +* If the operation was successful, the routine returns zero, otherwise +* non-zero. */ + +int glp_close(glp_file *f) +{ int ret = 0; + if (f->flag & IOWRT) + { if (do_flush(f) != 0) + ret = EOF; + } + if (f->flag & (IONULL | IOSTD)) + ; + else if (!(f->flag & IOGZIP)) + { if (fclose((FILE *)(f->file)) != 0) + { if (ret == 0) +#if 0 /* 29/I-2017 */ + { put_err_msg(strerror(errno)); +#else + { put_err_msg(xstrerr(errno)); +#endif + ret = EOF; + } + } + } + else + { int errnum; + errnum = gzclose((gzFile)(f->file)); + if (errnum == Z_OK) + ; + else if (errnum == Z_ERRNO) + { if (ret == 0) +#if 0 /* 29/I-2017 */ + { put_err_msg(strerror(errno)); +#else + { put_err_msg(xstrerr(errno)); +#endif + ret = EOF; + } + } +#if 1 /* FIXME */ + else + { if (ret == 0) + { ENV *env = get_env_ptr(); + sprintf(env->term_buf, "gzclose returned %d", errnum); + put_err_msg(env->term_buf); + ret = EOF; + } + } +#endif + } + tfree(f->base); + tfree(f); + return ret; +} + +/* eof */ |